A parody of the texting abbreviation for lmao (laughing my ass off) used in the facebook user group "I gotta have more cowbell."
Funny way to let the person you are texting with know that you think what they said was not just comical but hilarious!
texter 2. I don't know why did the cookie go to the hospital?
texter 1. Because she felt crummy!
texter 2. LMCBO!!!