A female who masturbates. ie. (slapping her
cunt). Could be considered the female counterpart to a
wanker. Its even more humorous to call your friend a "cuntslapper" than a "wanker" because it also implies that he's a female, and has a
cunt that he enjoys slapping.
"hey joe, you cuntslapper! get in the
car before we leave you behind!"
Person 1: "we had the week off of
school, and the coaches still made us come to practice the whole week"
Person
2: "aww....fuckin cuntslappers"