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Reverse Colgate challenge 

the act of inserting a flaccid penis into an anus.
I was so wasted that I couldn't even get it up. I had to settle for a reverse Colgate challenge.

Two oranges and colgate challenge in the middle 

This is a popular british challenge that consists of getting two oranges (small ones preferably) and putting colgate toothpaste in the middle of them and then eating them.
Yo bro, I'm gonna do the two oranges and colgate challenge in the middle tommorrow, it's gonna blow up!
What? Nah you're crazy man!