Very similar to a gunt, a pronounced bulge starting at the belt or rim of the pants, with the crotch area of the pants protruding outwards, creating a disgusting melon shape. Again, not quite a gut, not quite a cunt.
A gunt causes tremendouswardrobe problems. If she is not careful, she's going to give herself a twattermelon.
What to call people when there are being a twat. Usually describes someone that does something that requires a friendly reminder that they are being a vagina.
Why you get called a twatermelon:
1. Not following bros before hos.
2. Leaving a party early.
3. Not making a move on a girl.
4. Acting like you are drinking at party when you are really just trying not to look like a twat.
"Come over to my house. Mike is about fight some douche."
"I cant, I told Sara I would hang out with her tonight."
A way of calling someone a twat in the workplace. Used so that if said person were to report you for insulting them, no supervisor in their right mind could take the complaint, "He called me a twatermelon!", seriousily.
A Normal Employee: "I hate you so much Pete, you're such a twatermelon."
Pete: "I'm reporting you to Drew for unprofessional conduct!"