When yo man is pumpin' away and you're getting close to climax and he roughly inserts his penis and holds it inside your vagina for as long and as hard he can.
...Well, I hope you get thisletter, hit me back(answer me or write me back, trully yours, this is Dan.
By Mignon
Hit The Back Board
When a girl is so slight and of such small build that when having sex with a man, his penis if of decent size is likely to hit the back wall of her pelvis. Like with basketball, hitting the back board.