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!
by pipelayer24 June 1, 2013
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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.
by DoubleFistedThighSlapper January 30, 2019
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