The Mouse Trap

When a girl is licking your balls you lift your boner and release making a "slap" sound.

When a guy is getting head, he says somthing like "Oh S*** what's that?" and points, when the giver turns to look, they tuck the penis between there legs. When the giver returns to finish the job, you spread your legs, having the penis hit the giver in the bottom of the jaw.

the location where one keeps his cheese. A money clip or wallet.

A mouse trap is the pro-female version of the donkey punch. While the female is on her back the male is standing and penetrating. When the female nears orgasm she punches the male in the eye causing him to pull his upper body back and yell "WTF bitch!", but also causing him to thrust his pelvis forward for maximum penetration. A donkey punch and mouse trap may be possible simultaneously, but is purely theoretical at this point.

when a guy's cock get hard and he puts it between his stomach and his pants to hide the embarassment of public erection

When your partner declines to give you anal sex and you want it so badly that you drop your hips while taking it doggie style, thereby "mouse trapping" your partner into your rectal vault.

(This works best while the male has some sort of explosive diarrhea) A man lies on his back with his legs wide open while a woman slowly progresses (face first, mouth open) towards his testicles. Once the woman is approximately 3 inches from the "ball-sac" the man then releases massive amounts (or whatever's in his system) of diarrhea on her face, with the intentions of shitting in her mouth. Whether the crap landed in her mouth or not doesn't matter. A successful "Mouse Trap" has been executed.