A collective noun that refers to the male genitalia. It is derived from the combination of the words "man" and "kangaroo" since male genitalia, like a kangaroo, has a pouch (see "scrotum").

History: Use of the word began in Tempe, AZ in 2008 where it quickly spread to southern California.
It's hot out today; my mangaroo is getting swampy!

Argh! He kicked me right in the mangaroo!
by C. S. S. H. May 16, 2008

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