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1.
1) breasts that are flat and droop

2) a generic insult
Deakin: eeeew, i walked in on my nan in the shower and she had gibbon tits
Jake: mate, that is dirtyyyy!!!

or

Kurt: oi!! i did your mum
Jake: kurt, you are such a gibbon tits sometimes
by jakeeee haiggghhhh December 17, 2009

Words related to gibbon tits

gareth gibbon giben jake tits