gangsignusitis
Affliction wherein one compulsively throws up poser gang signs whenever a picture is about to be taken.
Jen: Everyone say 'cheese'! ...John, what are you doing with your hands, you look like you have cerebral palsy.
John: Sorry! It's my gangsignusitis, I can't help it!
John: Sorry! It's my gangsignusitis, I can't help it!