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!

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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.

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