The moststupid response ever, almost all normies use it. Its because they don't have the mental capacity for coming up with a great comeback. It is a stupid response, though some memers, and few dank memers use it, but only when dealing with normies.
Mike: Ur mum gae.
Bill: No u.
Liam: Guys! The normies are fighting!
Mike: Yeah, and ur mum gae Liam!
Liam: Fuck off Mike, I don't deal with normies, I'm a memer.