The crease of your pants, separating where the two balls are, stretching the sack like a frogs webbed foot.
I looked down at my boyfriends egregious frog's knuckle and told him he needs to go a size up because his nutsack was showing
by mattyctrapz December 27, 2018
I saw Tommy doing the nine ball knuckle shuffle yesterday in his room. He really needs to stop jacking off on weekdays.
by Stickee Fingaz September 21, 2013
by Fajasa February 20, 2024
Tribadism or tribbing, commonly known by its scissoring position, is a lesbian sexual practice in which a woman rubs her vulva against her partner's body for sexual stimulation, especially for stimulation of the clitoris.
by Metry Dirty D August 10, 2022
by Uhoo457 May 20, 2021
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 January 02, 2016