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1.
Performed by farting into a cupped hand, raising the cupped hand to the mouth and blowing the fart over the nearest victim.
Here mate, have a bumkiss.
by fartsoffortune September 08, 2010
 
2.
1. To press your bum against another person's lips when they are expecting your face.
2. A humorous surname.
1. He told me to close my eyes and then he bumkissed me!
2. You know that guy? Yeah, Mr. Bumkiss.
by Pennycook November 02, 2007