pulled a J-Mac

The quick or sudden departure in public from a group or entourage, or to disassociate one's self from being associated with a less than ideal social identity in public, especially to increase their perceived social status .

three business associates walking together at work Person 1: Hey what do you guys think about the price of tea in China? Person 2: "I think it's awesome ". Person 3 (J-Mac): "... ... " Persons 1 and 2 "wow, person 3 pulled a J-Mac move on us "