Its an abreviation for the word Dungar.
A Dungoo is a person who's crazy. They think they are cool / intelligent - but only in their own little world.
That girl is mad - she's such a Dungoo
a Coined term for a massive hangover
Guy 1: Man, when my mom woke me up that day to goto school, she turned on all the lights in the world and all i could say was "singa-dungoo"
Guy 2: haha
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