Cookie Monster Surprise 

When you crush some cookies, stuff them in her vagina and ass then eat her out and all remnants of cookie are rubbed in between her titties until she likes it

Person 1: Damn dude I ran out of Oreos for my Cookie Monster surprise so I had to use chips ahoy

Person 2: Damn that sucks, we know the best Cookie Monster surprise is with Oreos

Cookie Monster Surprise by PoosieBoi9000 May 12, 2016

Cookie Monster Suprise 

This occurance is the prolapse of a rectum, the process in which the colon falls out the anus, as someone is eating out the butt. The prolasped colon, in turn 'suprises' the person giving the 'anal oral'.

I was licking this girls butt, and then I got a cookie monster suprise. It was so gross.

Cookie Monster Suprise by Jon the Dude January 21, 2006