An excessively large amount of something.
I have an ass-mountain of homework due tomorrow.

Dude, you're definitely pulling an all-nighter.
by Iamabstract October 31, 2010
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noun, the medical condition experienced by female ski resort season-workers wherein rapid and protracted intake of high-calorie, often fried foods (usually justified on the grounds of perceived increase in physical activity) causes expansion of a formerly attractive posterior beyond normal dimensions.
Dude1: Man, this season was too f**kin' ace, but I'm looking forward to rotating back to the world and seeing some girls without mountain-ass.
Dude2: Quite.
by bombdog October 10, 2008
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This clever word was developed using the popular movie Brokeback Mountain, and its gay characteristics, as well as lingo from the hood to describe a friend that is acting gay or being a bitch.
John: Leave me alone!
Tyler: You a brokeback mountain as nigga!

Tyler: I'm not going out tonight, I want to stay home to watch Tope Chef and make pan broiled halibut.
Julie: You're being a complete brokeback mountain ass nigga!
by silverstreaks2004 December 19, 2009
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Someone's mom's ass that has a carpet on her ass and warts to go with it.
I wanted to do his mom sooo badly, but didn't realize that she had a rocky mountain ass crack.
by CutthroatMassacre June 8, 2007
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