Another term for a lesbian. To get a visual example, bend both the index and middle finger of each hand and bump the mid knuckles together thus simulating two vaginas bumping each other as lesbians do to get sexual pleasure, such as the extremely hot act of tribbing.
Guy 1: "Hey dude, have you met the new girl? She's hot!"
Guy 2: "Yeah, but dude she's a knuckle bumper. There's rainbows and shit all over her social network profile."
Guy 2: "Yeah, but dude she's a knuckle bumper. There's rainbows and shit all over her social network profile."
by MrFriendzone April 13, 2016
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by SheilaG07 October 5, 2016
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Get the knuckle magnet mug.99 out of 100 scientists in the world believe in climate change while the other is a real knuckle-dragger.
by jon doeh September 6, 2016
Get the Knuckle-dragger mug.Girlfriend: whatcha wanna do tonight ?
Boyfriend let's do a knuckle muffin
Girlfriend: eww sounds like butt stuff .. IM IN!!!
Boyfriend let's do a knuckle muffin
Girlfriend: eww sounds like butt stuff .. IM IN!!!
by Ahhitzap1rate May 23, 2016
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