Are these samples of what you're looking for? LOL (laugh out loud) LMAO (laugh my a$ off) IMHO (in my humble opinion) NOYB (none of your business) TIC (tongue in cheek) TTFN (ta ta for now OTL (out to lunch) IOW (in other words) FWIW (for what it's worth) NB(F)D (no big f... deal) And, BTW, welcome to the forums.
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Grammar GeekOMG, Philip, I had no idea you were so conversant with this stuff!