The result of way too much anal sex - the anus is so stretched out that when it returns to its 'not being penetrated' state, the extra skin forms a flap over the anus.

the foreskin of a gay man.

The skin that appears to be roast beef. Extending from the womans outer vaginal lips.
AKA: Meat curtains

Only pertains to fatasses; when the amount of flab you have overhangs enough to interfere with going to the bathroom and thus makes contact with urine or shit making the flab act like a mudflap behind a truck tire.

The unpleasant occurrence when one's excrement leaves the anus at such a trajectory and with such a velocity such that it gets friendly with rear part of the scrotum and or testicles

What you call a gay mans sack

a homosexual man's scrotum