TERM is... Autofellatio

which simply means that a guy is hung enough, limber enough to suck their own penis.

No way can a fat slob like me bend over enough, for that, but damn, it sure would be nice.

Many adult sites call it Self Suck, but not many actual self suckers can really bring themselves off, totally.

Yes, they can suck their own cocks, or at least the cockhead, but not for long, unless they are super limber.

For more info visit:
Gaydemon Dicktionary.