Verified answer

btw= by the way... rotfl= rolling on the floor laughing.. lmao = laughing my *** off.... lmfao= laughing my ******* *** off.. i know that you didn't ask for all this, but just wanted to be extra helpful!! =)

BTW= By The Way. meaning as a side note to what the person was originally talking about.

BTW = By The Way

BTW = By The Way... or if french is more appropriate for you, it's "a propos"...