Joking on the Square

A diplomatic way of telling a friend their outfit sucks, their boyfriend is ugly, they need to use more conditioner, etc. by making a joke about it like you’re kidding.
Usually they will get the hint without getting mad.

Hey Megan, (laughing) man I love those jeans, I haven’t been able to find those lately, did you get them at a garage sale?
Megan: Are you joking on the square dude??