Cherry Surprise

A female deliberately failing to tell a dude that she's on her period before he proceeds to go down on her.

while the male is positioning his penis between a womans heaving bosum and then he proceeds to ejaculate on the females face and then punches her in the nose and yells "surprise".

When a man anally piledrives a menstruating woman (preferably with a huge bush), shits in his hand (preferably behind his back so she doesn't see it coming), then smears the feces onto her bloody vagina and yells "SURPRISE!"

When a man is screwing a woman while she is on the rag, and as he makes every thrust he says cherry, after a little while he quickly exits the snatch and enters her ass, at the same time yelling chocolate surprise.

A cherry pie surprise is when you have sex with a girl who is on the rag while you have no idea. Made famous by some dude named Jake Daniels.