Used to describe big man boobs. This word originated from the phrase "Big Bouncers" when it got translated incorrectly. A common adverb to this would be, "jiggly", thus "jiggly mamoons".
Phil: Look at that kid with mamoons!

Benny: Gross!! They're all jiggly..
by kirAiSaLiVe February 23, 2009
Compliment for girls. Whenever saying it to a girl you're usually complimenting on their looks. Means they're beautiful, pretty, skinny, and just lovely in every way.
Did you see her boobs?!? She's such a mamoon!
by Teeheeumadming? April 26, 2013

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