fbidlol 

F- funny
B- but
I- i
D- didnt
L- laugh
0- out
L- loud
it a word that you use when you think somthing is funny, but you dont laugh out loud.

a texting conversation...

Tom- why does helen keller only mastrubatm with one hand?

Bill- idk why?

Tom- So she can moan with the other!

Bill- Fbidlol

fbidlol by sam wise gamchee May 11, 2009

FBINLOL 

Funny, but I'm not laughing out loud. Used when LOL would not be an accurate statement.

Jimmy: OMG, my Coke can just exploded over my keyboard!
Steve: FBINLOL

FBINLOL by Honest Chat November 25, 2009