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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
Gibbous by rich wazza March 11, 2007
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.
Gibbous by Excel November 14, 2003

wax the gibbous 

To perform fellatio during one's period. Used especially if the period falls between the first half and full moon phases.
Dude, when I get home, my girlfriend is going to wax my gibbous.
wax the gibbous by Nyarlathotep February 18, 2004

Waxing gibbous 

The name used to call a certain Finley courtier when he gets loud. Can be used in conjunction with ‘your fat’ or ‘fucking whale’ for maximum effect.
Beck: hey fin wattup u waxing gibbous

Fin: hey that’s so mean I only gained 25kg over lockdown what the hell man
Waxing gibbous by wittybanter1239 September 21, 2020

Glibberish 

My coworker is very glib with a rationale for everything, but upon reflection,it's pure glibberish.
Glibberish by Melvid October 6, 2018
to be of scandal; when you're showing a lot but not too much; being provocative; classy yet trashy
Look at that gibbous bitch over there.

This lace makes me feel a little gibbous...
gibbous by cristozombie March 2, 2015