Aviva Drescher Throws Leg ... But Says It’s NOT A Weapon ... Or Sex Toy (VIDEO)

"Real Housewives of New York" star Aviva Drescher doesn't have a leg to stand on ... by claiming she never used her prosthetic appendage as a weapon -- and there's video proving she's lying.

We got Drescher outside Sanctuary Hotel in NYC Tuesday night and asked about her EPIC argument on the RHONY season finale ... when she angrily detached her artificial leg and HURLED it toward Heather Thomson.

Drescher claims she wasn't trying to hurt anyone with her prosthetic projectile.

But you gotta see her reaction ... when she discovers some guys get their rocks off ... by watching women who take it off ... their leg, that is.