The Liberty Bell is a lewd sex act in which a male spreads his legs while standing and squats down just bit. While squatting, he then holds and raises his penis, leaving his testicles dangling free. A woman then lies down underneath and inserts the entire testicle sack into her mouth, shaking her head from side to side much like ringing a bell. Ideally, the woman performs this act with such aggression that crack(s) can form at the corners of her mouth, much like the cracked Liberty Bell.
Man, Garth hooked up with some dumb ho last night. Dumb bitch got so drunk she gave Garth a liberty bell.