1. Something that is protruding and surprizing at the same time. Often the protrusion is the cause of the surprise.

2. When a woman conceals a strap-on/dildo and you are fucking or about to fuck, when suddenly she unleases her toy on your anus.

3. When you wake someone up by sticking something in their ass.
"My ass still hurts after my girlfriend decided to give me a protruding surprise..."

"Wow! What a protruding surprise!"
by Argonak April 12, 2008
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