Thought You Had a Friend 

A way of fooling or tricking someone that you cool with them, as you would reach out and act like you giving them a high five or genuine handshake but pull back and laughing at their expense.

First Guy: "yeah man, we cool. Give me some dab."
Second guy reaches out to dab his fist.
First Guy: (pulling his hand back) "Thought you had a friend." (Turns to laugh at his expense)

Thought You Had a Friend by bbrooka April 8, 2018