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M. P. U. stands for Mounted Penis Unit. It’s like a motorized dildo on a shoulder that smacks your face while you try to keep from screaming.
My M. P. U. broke during a session. I had to go to the ER. My face was red and my pride was shattered.
I brought my M. P. U. to a party. My friend asked, 'Are you gonna practice or just show it off?'
My M. P. U. has a setting for 'normal' and 'screaming'. I only use 'screaming'.