If you're not completely up-to-date on all the wedding lingo, here is a cheat sheet for you to follow.
BP: Bridal Party
DW: Destination Wedding
FBIL: Future brother-in-law
FFIL: Future father-in-law
FG: Flower Girl
FH: Future Husband
FMIL: Future mother-in-law
FOB: Father of the bride
FOG: Father of the groom
GM: Groomsmen
GP: Grandparent
MOB: Mother of the bride
MOG: Mother of the groom
MOH: Maid of Honor
RB: Ring bearer
Although you may not use this "cheat sheet" often during your wedding planning, I thought that they were kinda fun to know :)