When you aggressively stroke your cock so hard you shit yourself. This may cause small lacerations along the shaft/tip, and or severe fright from masturbation.
Friend: "Is Tommy here?"
Mom: "Yes, he's upstairs in his room"
Friend: "Okay" *goes to walk upstairs*
Mom: "I wouldn't go up there unless you want to watch/hear him clenching the wrench. He's been doing it all week."
by microwave420.69 September 24, 2019
Get the Clenching the Wrench mug.