contrary to popular belief, BBM does not stand for 'BlackBerry Messenger'; it bears a slightly more disturbing meaning. BBM is actually short for 'Big Black Meat', or so some Twitter users seem to think (one example being @BigBlackMeatMan). The abbrevaition is almost always used with the name Darelle, for reasons unknown.
One thing is for sure, and it's that this word causes great confusion in the Twitterverse.
random Twitter user: I just got #BBM, add me! My PIN is 'XYZ123'
Darelle: I WAS BORN WITH #BBM YOUNGBLOOD
random Twitter user: I love #BBM! It's so nice for getting in touch with friends
Darelle: I'LL GET MY #BBM IN TOUCH WITH YO LITTLE WHITE ASS, YA DIG ME LOL