When a man masturbates underneath a blanket, and it appears as if he is punching the blanket due to the rapid up-and-down movement of his hand. This can also be used as a joke by a guy who wants to appear as if he is masturbating, however when he is asked what he's doing, he simply says, "I'm punching the blanket."
by padsy69 April 15, 2011
Get the Punching the Blanketmug.