When a girl or guy that has a boyfriend/girlfriend and has sexual intercourse with another girl/guy, or when they don't have a boyfriend/girlfriend and they just have sexual intercourse with a person without a label.
"he's humpin and bumpin with someone else!"
":o"
"those people are humpin and bumpin"
"they're not even dating, though?
":o"
"those people are humpin and bumpin"
"they're not even dating, though?
by 0001122 February 19, 2011
Get the humpin and bumpinmug.