Your mom Is fat

It's a derivative of the "Your mom" insult. The function varies slightly from the original insult as it specifies the condition the so-called "mom" is in.

Rob: Your mom Is fat.
8yo kid: *cross*

your moms fat juicy mommy milkers

Your mom’s tits. 😐 What the fuck did you think I’d say?

Your moms fat juicy mommy milkers are summoning me to an early grave.

Your mom is so fat

start of a roast battle

mommy suck my balls your mom is so fat