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It is a sexual act usually following after the act of fellatio. The man will then proceed to ejaculate into a crevice created by her wedging her breasts together. After the process of ejaculation he sticks his face into the breasts covered with his own semen and wish washles around.
Dude, she gave me head and I totally gave her the Michigan Motorboat.

No way dude.

Ya I can still taste it.
by The Michelan Man January 08, 2009
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