My sister im's me all the time- it gets worse.
Here's the conversation:

Her: lq2ms (Laughing quietly to myself.)
Me: What do you want?
Her: w8, kk? bz atm (Wait, okay? Busy at the moment.)
Me: I swear I will block you.
Her: lk, omg, y? (Like, oh my God, why?)
Me: ...
Her: o wv. ur z, ngl. (Oh, whatever. You're so boring, not going to lie.)
Me: Going now.
Her: n, NNN, w8! i iid HIM, kwim? (No, NO NO NO, wait! I saw HIM, know what I mean?)
Me: Don't care. Leaving now.
Her: wdymbt? (What do you mean by that?)
(I sign off.)
Her: ??? NW! ur sz, u pft! i h8 u! (No way! You're so boring, you ---! I hate you!)

I asked her later what pft means, since I had never seen it before, and she said she and her friends made it up. As near as I can tell, it translates to 'piece of fish turd'.

Pretty bad, no?