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1.
(noun) A pile of people or animals, usually with one individual on the bottom of said pile.
(verb) To pile on; the act of creating a monkey pile, often used in the intransitive imperative form.
Wow, that huge monkey pile on Newt Gingrich must be crushing him!

Monkey pile on Newt!
by Beer Titan February 01, 2013
 
2.
an excited way to like a Barrel Full of Monkeys, a big jumbled pile of hard parts all akimbo, like dungeons and dragons lead figures or nails made of gold. A stack of paintings un-straitened or skewey.
I just got a monkey pile of paints!