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.
#1:
"My ass still hurts after my girlfriend decided to give me a protruding surprise..."

#2:
"Wow! What a protruding surprise!"
by Argonak April 12, 2008
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