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!
Refers to when a player receives a "Killamanjaro", a medal in the popularvideo gameHalo 2 given for a string of kills, but implies that was earned by killing "newbs", and not respectable players.
I got a manjaro by killing those stupid babbling 13-year-olds over and over again.