level 10 friendship

The act of having a threesome involving that friend.

In the case of two guys- you iffel tower that girl, and double high five each other
In the case of guy and girl- she will bring in another girl and while the guy is fucking the other girl (who is eating out the friend) you high five each other

"Yo I got a level 10 friendship with her"
"No way, you're lucky as he'll man"

by Josh Gropin' May 1, 2014