fucks around. I already knew of calling the cock the third leg. But I only ever thought of three-legged dogs as being dogs with a missing leg, since those actually are real things. Anyway, what tipped me off was these lyrics by Shel Silverstein.
[Verse 1]
Down in Louisiana where the black trees grow
Live a voodoo lady named Marie Lavaux, no
She got a black cat tooth and a mojo bone
And anyone wouldn't leave her alone
She go GREEEEE-AGHH
Another man done gone
[Verse 2]
She live in a swamp, in a hollow log
With a one eyed snake, a three legged dog
She got a bent bony body and-a stringy hair
And if she ever seen you messin' round there
She go GREEEEE-
Another man done gone, gone