a name for someone who your group of friends doesnt particularly like to hang out with, but if you are alone and all other friends are busy, you call your "triple b" and they are always anxious and willing to hang out.
pretty much a friend who will always be a last resort and they have no idea.
fred: of course, is The Triple B coming?
fred: uh, no dude.
bob: thank god...
-a day later-
bob: hey mark! freds out of town, do you wanna come over and chill?
mark: WOULD I EVER!
1 Beach ride
2 Beach Blowjob on the sand
3 Beach Blowjob Break-up (right after)
Thus we get "The Triple B"
(ADJ form): Holy shit that's so a triple b look.
(VERB form): You're pussy whipped man! It's time for you to man up and triple b that bitch.