To lose control of one's bowels. Pronounced "el" "comb." Lcomb is an abbreviation for "lose control of my bowels." It is used as a synonym for "lol."
David: Haha that was so funny I nearly spritzed! I'm pulling a whoopi!
Peter: I just lcombed!
David: Peter, you're always losing control of your bowels...
Prices shown in USD.