Mac/PC
When two people who hate each other's guts fake being friends just to laugh at each other behind their backs. It all started with some stupid ads where a guy and a dude pretended to be Macs and PCs.
My cousin and I pretend to be best friends just so we can roast each other in class.
My mom and her friend act like they're besties but they're both just trying to make fun of each other's hair.
My brother and his friend claim they're best friends but they can't even stand each other.