a less scientificdescription of female-female tribadism often used by lesbian/bisexual women to indicate past relations had with another woman when talking about or introducing her
Jane: that was fun last nightdancing with lucy
Fran: yeah we used to bump cunts
or
jane, i want you to meet lucy
Lucy: fran and i used to bump cunts
When you fist a female during foreplay or intercourse and you slide your arm so far up her vagina into the uterus you can feel the back linining of the uterus with your hand. Or in other words yo cunt bumped dat' bitch.