Titgina
When a chick has huge boobs, and proceeds to tittyfuck, providing a nice, fuckable opening between her breasts.
Dude 1: "Dude! Did you see the boobs on Christy?"
Dude 2: "Yeah! Shit, I bet they make a great titgina"
Dude 2: "Yeah! Shit, I bet they make a great titgina"