An object on which to rest your testicles. Common objects include a chin, a bag of ice (after a kicking), and a butthole (during intercourse).
Ron - 'Hey, Tim. Last night I turned Sally's chin into a scrotum couch.'
Tim - 'Sally Winters?'
Ron - 'Yeah. She was all over this shaft.'
Tim - 'You son of a bitch. I'm dating her now.'