Top definition
Gigglebump is the term that describes when two women with ample bosoms collide bouncing off one another followed by an uncomfortable pause or giggling.

It is frequently used by lesbians/bisexual women as a litmus test. Men cannot perform this action, even if they have breasts.
Man, I'd love to bend over either of those gigglebumpers.

My wife got this chick for us at the bar by gigglebumping around.
by Visui August 14, 2009
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