Top Definition
The act in which a girlfriend seduces her boyfriend for sex. However, once inside her, the boyfriend realizes that he has entered a dark and bloody mess. Often accompanied by a foul odor and a girlfriend shouting "Boo!" Most often occurring around Halloween.
Last night was Halloween and my girlfriend was on her period and I didnt know. To make a long story short, she gave me a Halloween Surprise. Needless to say, it was a mess! :(
by da hbomb October 27, 2011

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When you drill a hole in a bowl of candy and stick your penis in so the next dumbass kid who sticks his hand in gets a little extra "candy" than he bargained for.
"Tonight whoever comes to my door is gonna get a little 'Halloween Surprise'"
by marklar July 23, 2004

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Lotsa space for your liquids.

Buy the mug

The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt