When two girls have sex with one dildo facing away from eachother.

An ugly ratchet hoe

When a couple has doggy style sex and the man keeps pushing the girl toward the edge of the bed until she almost falls off. She is then forced to clamber onto the edge of the bed with her fists like a mountain goat climbing down a mountain

When men assemble in a human pyramid, but put their testicles and dick through their legs so it looks like a goat. Hence, mountain goat is a mountain of people in this 'goat' position. It is often done inside a room and used to shock a person walking into the room.

Like a cougar, only older & with chin hair. They typically try to dress trendy, get with young cabana boy type guys, have ginormous acrylic nails, processed hair, and liver spots. May or may not be a sugar mama, depending on the wealth (or lack thereof) her first (and/or 2nd-3rd-4th) husband had.

If not wealthy, Mountain Goats can often be found residing in trailer parks, with at least on piece of Dolly Parton paraphernalia.

The male equivalent of cougar.