Knob lobster

A girl who gives bad handjobs, often preventing proper blood flow throughout the penis because of too strong of a grip

"Man I was getting a handy from this girl last night and she was like a knob lobster gripping my shit"

lobster knob

When an erect penis has experienced a high frequency of masturbation within a small timeframe.

Resulting in a penis with a resemblance to the color of a cooked lobster.

Jake and Josh were at the pub, Jake turned to Josh after a busy day of masturbation and described his penis as having lobster knob.