The act of grasping a girls ass and pussy at the same time. Your thumb is on her ass and the remaining fingers are on her pussy.
I met this girl at a club and when she turned to get a drink I gave her the Lobster Claw. Instead of getting a drink, she pulled me into the bathroom where I not only Lobster Clawed her somemore, but did it with her pants off.
Derived from the ancient Greek practice of male on male fellatio with one small catch (or pinch); the male giving the fellatio must reach around the asshole and gently (or violently depending on the mood) insert hand/instrument (lobster claw) into anal cavity.Usually results in 3-4 hours of heavy bleeding from the anus.
After giving Lizzy a Rusty Piccolo I proceeded to give Jim a Lobster Claw until he bled to death.