Similar to hydroplaning, the act of slipping on lost sperm usually found on the floor.
"Dude, I almost cracked my head today."
"What happened?"
"I was cumplaning."
"That's why I have carpeted floors"
by AirRoar February 26, 2010
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When a pilot of a major airline watches porn while flying the plane, and he starts masturbating and he cums all over the controls. The controls break, and a flight attendant goes in the cockpit to investigate, and the pilot cums again, this time on the flight attendant’s face. The flight attendant also masturbates, and soon all the passengers on the plane start masturbating to the point of ejaculating. The plane fills up with cum and some shit. The plane then crashes into the ocean, and leaks shit, cum and other junk into the ocean.
Korean Air Flight 2147483647 did a cumplane.
by MrPhoton June 28, 2018
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