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1.
The act of semen ejaculating with such great force that it hits the ejaculator's chin.
Shaun's girlfriend kept stopping and starting giving him a handjob, so when he finally came, he gave himself an uppercum.
by Wetbeverage April 30, 2011
 
2.
The act of blasting yourself in the chin with a powerful load and knocking your head back. Usually occurs while stoned. Very embarrassing and usually results in an itchy chin all night, no matter how thoroughly you wash.
Shaun "Dude, I was getting a handjob from some chick last night while i was stoned and i gave myself an upper cum!"
Spencer "Shut up."
by notSkelly July 01, 2011