An act of masturbation in which the perfomer places both hands firmly on the penis. He then proceeds to twist his wrists in opposite directions, as if grinding pepper.
I felt like i needed to switch it up last night so i went with the peppergrinder last night.
The act of feeding someone some imaginary meat (Penis) when they are yawning. As the yawn starts and the eyes close you pretend to throw dick meat down their throat in a peppergrinder fashion while saying, "Aww yeah bitch, take that dick".
Chuck yawned and Seanpepper grinder'd the shit out of his face.