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1.
A place well hidden (in some trees, behind an abandoned building, etc.) where pot heads will usually gather to smoke their weed.
Boy #1: Dude my mom's home, we can't smoke here.

Boy #2: It's cool we can just go down to the happy spot.
by rawrrr87 March 12, 2009
 
2.
a happy spot refers to the genital area of a man or woman.
"i was all up in that chicks happy spot last night"
by Josh Curtis October 15, 2009