It's when you find out that she is a he.
I had a Bangkok surprise last night
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The sexual act of a man ejaculating into there partners mouth, then rubbing their penis along their teeth simulating the brushing of teeth.
Johnny:"Mommy, why are you're teeth so white?"
Mom: "Well daddy is really good at fluoride Surprises."
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When you are fisting a girl and are about wrist deep you open your hand out and give her a sunflower surprise.
Friend 1: aw man I gave my GF a sunflower surprise last night and she almost died
Friend 2: bro..thats just grim
When someone trims their pubic hair and places the trimmings into an envelope (preferably putting them into a birthday card first), addresses the letter and sends it to somebody
I hate the new kid in town, lets "Hairy Surprise" him. I KNOW! I'll write in the card: have a hairy merry Christmas!
When several people wait for someone to come into a room and then all fart at the same time.
We'd all eaten some kickass chili. We had a big surprise farty for Dave when he walked into the room. It really stank up the joint.
When you go down on a woman and she farts.
" I was licking the wife out last night and she let one rip, felt like my eyes were melting and my lungs were on fire. A real chernobyl surprise"
When you have a dick in your mouth and Oreos up your ass
Yea Tom gave me a Zebra Surprise last night.