Top definition
A person who is happy or laughs for no reason.
A person who laughs very loudly and annoys everybody.

Shit happy is a transliteration of a tamil phrase: "mayir santhosham"
Ben: Hi Greg. What's up? How was your day?
Greg: HAHAHAHAHAHAHAHA
Ben: Why are you so shit happy?
by Sunny Beach July 01, 2013
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