A sexual act in which a male double fish hooks a female's butt hole, and while spreading it open to the maximum gape, the man lowers one testicle into the cavernous sphincter. When the testicle is in place, release the hooks and the sphincter clamps down onto the sack like a bear trap.
In order to reach climax, I utilized the bear trap technique with my girlfriend.
Taking a beer bottle cap, slightly bending it like a taco then position it in your hand between your thumb and pointer finger. Wait for an unsuspecting victim to walk by and without warning, pinch the cap the rest of the way closed on the victims nipple while screaming " Watch out for that Bear Trap!"