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when a female masturbates
Did he watch you spank your monkey.
my brother was spanking his monkey while he was watching porn
Spanking your monkey is the act of masturbating and slapping your scrotum simultaneously. One may use this term as a synonym to jerking off or gooning.
After seeing Joe spanking his testes while jerking off, I found out he was spanking his monkey.
Later I confronted him saying "Were you spanking your monkey?"