Cumprise
Ejaculating into or onto an orifice without said orifices knowledge of potential ejaculation
It was brtttney's birthday so instead of getting her a present I gave her a cumprise!
cumprised
the act of ejaculating prematurely and being surprised about it
Dude, the Russian hooker was giving me a great hummer. So great that before I knew it, it had cumprised and I surrendered my fifteen dollars.