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3.
A euphemism for being high on weed
(puff)
Cough cough! Shit, this weed got me gibbous dude!
by L Wrong June 19, 2006
 
1.
A phase of the moon in which it is more than half full, but not entirely full.
The waxing of the gibbous moon bathed the courtyard in a kind of cold starlight.
by Excel November 14, 2003
 
2.
The state of a penis between a semi and a full blown erection.
I was so drunk, she had to make do with my gibbous
by rich wazza March 09, 2007