To ejaculate at one's computer screen while having videosex with a partner or while masturbating to any image, sound, or text appearing on your screen. (verb) The ejaculate that lands on one's computer screen while having videosex or masturbating to content on one's screen. (noun)
I was online watching my girlfriend go at it with a Duke and Duchess, and I finished off with a mighty screencream just as she was peeling herself off the ceiling.
by The Pig Farmer's Grandson April 11, 2010