Here's a glossary of commonly-used terms and acronyms in the WeddingWire Forums:
AW: attention whore BFF: best friend forever BM: bridesmaid;best man BR: baby-related b-pics: boudoir pictures bump: to send a thread to the top of the forum DH: dear husband DMV: DC, Maryland, Virginia DOC: day-of coordinator DS: darling spouse DW: destination wedding; dear wife e-pics: engagement pictures ITA: i totally agree FG: flower girl FH: future husband FI: future intended / fiance FFIL: future father in-law FIL: future in-laws FMIL: future mother in-law FS: future spouse FW: future wife GM: groomsman GTK: good to know HR: house-related HTH: hope that helps JR: job-related KWIM: know what I mean KWR: kinda wedding-related IMHO: in my honest opinion IMO: In my opinion MOB: mother of the bride MOG: mother of the groom MOH: maid of honor MUA: make-up artist NTK: need to know NWR: not wedding related OOT: out of town guests OP: original poster PIA: pain in the you-know-what PM: private message PP: previous post PSA: public service announcement RB: ring bearer SMH: shaking my head STD: save the date TIA: thanks in advance TTC: trying to conceive TTD: trash the dress TRC: totally random conversation WTK: want to know