The act of stuffing your cock and one testicle between your legs, while leaving one testicle out. Therefore creating a vagina with one ball. hence, the one ballgina.
1)have you ever tried stuffing your cock and one ball between your legs?
Yeah dude it's called a one ballgina
2)check out that guys one ballgina. It is revolting.
3)that guys one ballgina turns me on. It's so majestic.