cumkill

any unpleasant thought and/or mental image (ie family members, global disasters, priests, etc.) that comes into your mind right at the moment of ejaculation.

"Dude, Rob pulled me aside just to tell me he got cumkill last night."
"What exact form of cumkill?"
"Father Flannigan."
"Dude. Sick."

by tinkyfinky May 6, 2007