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.
What you simply have to say to the overweight, psoriatic bitch in the office who takes crisps out of the packet individually, annoying everyone else in the building, instead of emptying them all out and turning ten minutes of irritating rattling into about 3 seconds.
Empty the fucking packet onto your table you fat ugly bitch. Better still, stop eating crisps altogether you hideous mountain of lard.
by Supernatural England August 10, 2009