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1.
a) Acting or being ridiculously happy.
b) A ridiculously good mood.

Comes from a mispronunciation of the word hyphy made by me while I was rolling balls.
"I feel hella haphy right now, bitch."
"Damn, that dude is haphy as a mothafucka."
by daedalus0x1a4 April 06, 2008
 
2.
Haphy movement or lifestyle of being crunk or full of enrgey
slang from da bay area
Tell me When to go iz da most Haphy song eva
by uncle Don April 22, 2006