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The act of pissing inside a girls pussy while your still inside her.
Tony- "Oh my god i gave this girl the worst yellow surprise, i was drinking coors light all day."

Bob- "Dude same, my girlfriend flipped shit."
by Madonna Is Hott. April 27, 2010
When you wake up, and discover that a Chinese man is engaging in sexual intercourse with you.
Last night I got a yellow surprise. It scared the crap out of me!
by Petey B. May 23, 2006
A snowball made of disgusting snow/slush from the side of the street mixed with a generous portion of urine. Often this snowball is thrown at someone unexpectedly.
Dude I hit that nerd with a yellow surprise!
by Dr. Deejay Narnar January 13, 2011