Big chest on floor laughing. Originated from ofl (on floor laughing), used by men that compare the amount of bench presses they can do in a minute, that take pride in the psychical appearance mainly focused on their frontal chest region. Instead of these men "LOL" Laughing out loud they believe their chest is too big so they have to put their 'big' chest on the floor laughing.
Big boy A: Bro I saw that hot chick from the gym and her boobs were massive!
Big Boy B: Bcofl