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.
by Bunch ‘O Cunts January 31, 2018
Get the lobster knob mug.
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"
by CK1052 June 23, 2021
Get the Knob lobster mug.