This is an acronym for Kiss My Balls. Originated when Kiss My Butt/Ass had lost it’s effect. This saying is often used in jest/humor as opposed to in anger or disgust.
"... so I told them they could KMB."

or simply

"You can KMB."
by WHIV May 21, 2004
Get the KMB mug.
Kick Michael's Bag

If a person shouts KMB, and Michael is in the vicinity, then his bag must be kicked. If Michael is not present, he is to be replaced by another person with a name beginning with M
KMB! (sounds of a bag being kicked)
by nev errington November 26, 2009
Get the KMB mug.
Kiss my Balls (for wannabes or people who fake or just copy,for irritating assholes for unwanted people..) etc
Q-can i come to the movie with you..?
by Budhu January 20, 2009
Get the KMB mug.