A particular configuration of male genitalia. The testicles are sagging and their weight draws out two vertical ridges of wrinkled skin. The penis itself is small and shrunken, seeming unnaturally high in contrast to the dangling testicles. The whole configuration resembles a dried up hairy vagina with hideously swollen and bottom-heavy labia and a protruding, disfigured clitoris.
Guys who are still taking speed after they are 50 probably have a mansnatch.
I've gotta lose some weight, my cock is retreating into my mansnatch.
Dude, are you sure you're mum's a chick? I saw her in the shower and I'm pretty sure she had a mansnatch.