Forget people and their normal texting abbreviations.
Here are the Super Paper Mario equivalents -
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BF = Blumiere's Father [Nastasia tries to use this so Bleck didn't get mad but almost got caught anyway]
DM = Dimentio (lives) Matter [Dimentio began using this after he found out Mario destroyed all of the clones in his secret room]
TTYL = Tippi Takes You Literally [Merlon started this one]
JK = Jaydes Killed (me) [When you get judged lol]
RN = Rubees Now [Mimi's favorite]
TFW = Tippi Feels Weird [Merlon texting Mario that Tippi fainted]
TIA = Tippi Is Angry [Whenever you go against what she's saying lol]
WTH = What Tippi Hates [Mentioning anything bad against anyone EVER]
BAE = Bleck Always Empathizes [Bleck texting someone still in third person for some reason]
OMG = Oh My Grambi [No explanation, really]
YTB = Yield To Bleck [Nastasia's and minions' favorite]
BC = Bleck Cares [Bleck still texting in third person cuz he probably would]
BTW = Bleck Talks Weird [Literally anyone who doesn't know why Bleck talks like that]
LMK = L (was) Maybe Killed [Dimentio used this texting Nastasia]
IRL = Is Really Luigi [Someone trying to reveal Mr.L's identity]
TTYL = Tippi Told You Losers [When Tippi leaves the heroes to die after she told them so]
SMH = So Many Hearts [The heroes during the journey]
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Now for some texting between SPM characters with these >:3
Assume it's just post-game or something. XD
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Mario: OMG, SMH...
Peach: But it's over, thankfully.
Tippi: What is Mario talking about? What does "SMH" mean?
Merlon: They're abbreviations, Tippi.
Tippi: ???
Mimi: You don't know what those are?!?! OMG-
Tippi: ._.
Tippi: I don't get it.
Bleck: Bleck doesn't get it either.
Nastasia: Yeah, it started around the castle when I just used the abbreviation YTB on all of the minion memos.
Dimentio: Didn't you also make the abbreviation BF~?
Bowser: How is clown boy here?!??
Mimi: Didn't you die or something?!
Dimentio: Yes, as you like to put it, JK.
Dimentio: The Underwhere prison has surprisingly good connection.
Bleck: Dare Bleck asks what BF is..?
O'Chunks: Don't it mean Blumiere's Fath-
*O'Chunks Has Been Kicked From The Chat*
Mimi: O-O
Nastasia: Yeah, as I was saying, I don't remember what it was.
Dimentio: How convenient...
Tippi: Oh.
Tippi: I think I get it now.
Tippi: TIA at Nastasia.
Nastasia: Uh...
Nastasia: Are you sure you know what that means?
Tippi: You kicked O'Chunks.
Tippi: >:(
Luigi: No, I think she gets it.
Peach: Bowser always used the abbreviation BTW. -w-"
Tippi: :O
Tippi: That's WTH.
Tippi: So mean. -'m'-
Bleck: Ahhhhh...
Bleck: Bleck thinks he gets it now.
Mimi: Ya sure, County?
Bleck: BC about Tippi.
Bleck: UwU
Bowser: o-o
Dimentio: o-o
Mimi: o-o
Nastasia: o-o
Mario: o-o
Peach: Aw.
Tippi: o/////o
Tippi: TFW.
Tippi: My face is really red.
Mimi: LET'S CHANGE THE SUBJECT PLEASE
Nastasia: Dimentio, where's Mr.L?
Dimentio: Luigi is right here.
Luigi: Hello!
Luigi: ^^
Nastasia: I said Mr.L.
Dimentio: Mr.L IRL, Nastasia. You hypnotized him, for Grambi's sake.
Nastasia: Then what happened to him?
Dimentio: LMK.
Nastasia: Really? -_-
Dimentio: It's a mystery that will never be solved, like the answer to life.
Mr.L: Can you please stop blowing up my inbox, I'm trying to NOT have my phone die.
*Dimentio Has Left The Chat*
Mr.L: What's his deal?
Mimi: You're alive?! :O
Mr.L: No.
Nastasia: Where are you?!
Mr.L: The Underwhere prison.
Mr.L: I can literally see Dimentio seven cells down.
Bowser: o-o
Peach: o-o
Bleck: o-o
Nastasia: o-o
Tippi: o-o
Mario: o-o
Mimi: NEW SUBJECT.
Mimi: L, where's my money?
Mimi: :3
Mr.L: I'm kind of DEAD, in case you didn't notice.
Mimi: Don't care.
Mimi: RN.
Mimi: And tell Dimmy that he owes me too.
Dimentio: Do not!
Mr.L: Hey Dim.
*Dimentio Has Left The Chat*
Mr.L: Overreact much? Yeesh. -_-
Bleck: BAE with Dimentio. It's partially Bleck's fault he's dead.
Dimentio: Entire fault.
Tippi: Hello again!!! ^^
Dimentio: I just came back because I want Mario to know that DM.
Mario: What?
Mario: Why?
Mario: And why did you use plural?
Dimentio: I went to my secret room in the mirror hall before I died and all of my clones were dead.
Dimentio: WHAT DID THEY EVER DO TO YOU?
Dimentio: They were so young. q-q
Peach: o-o
Bleck: o-o
Nastasia: o-o
Bowser: o-o
Tippi: o-o
Mario: o-o
Mr.L: o-o
Dimentio: What?
Mimi: Awkward.