thigh slapper 

An extremely long penis that slaps the thighs when doing anything naked

I went skinny dippin the other night with a bunch of hot chicks until Jeff jumped in with his big thigh slapper and took home all the pussy!

thigh slapper by pipelayer24 June 1, 2013

Double fisted thigh slapper 

A penis so large it involves having to use two hands to hold it/masturbate that also slaps the thigh while naked.

Also called a DFTS.

Damn dog, women must run when you bust out that double fisted thigh slapper you keep hidden away.

Jeff walks funny due to his double fisted thigh slapper hanging low.

Double fisted thigh slapper by DoubleFistedThighSlapper January 29, 2019

slippery thighs 

Most popular in prison these days, slippery thighs has become the act of repressed homosexual desires unleashed. the two partners make love to each others thighs while sticking the feet of one another in front of the others face, this is done with a great deal of spit and or sweat.

3rd base prison rape,slippery thighs

slippery thighs by brandrip May 25, 2012