A post-nut boner which is in the descending phase resulting in a chub, but not yet fully flaccid.
Man, I nutted over a half hour ago and still have this waning gibbous.
How long ago did you nut dude? I can see your waning gibbous through your pants.
Nothing like walking around the apartment with a waning gibbous swinging around like a wrecking ball.
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Gibbous Fowl: Derogatory proper name for someone espousing an absurd philosophy.
Gibbous Fowl what in the world are you talking about?
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When you're neither half nor whole, you're nothing! A person or a state of being who is inconsistent. Not quite all the way there.
Dave you blabbering gibbous, make up your mind!