A big for nothing bitch. In their natural habitat they can be found sucking major dick in the Toronto, Oh area… you can often find them struggling to get back up off of their knees due to the fact that they are so top heavy.
“Is that a fat hooker walking down the road?”
“Is it a homosexualcow?!”
“Oh… no. It’s just fat matt plumpkin.”
When you want a conversation to be done and over with, but people won't stop so you declare fat rat. This is used to distract from an otherwise difficult or annoying conversation topic.
Whenever someone gets deep into politics at work, Benjamin always declares "Fat Rat" and the conversation is over.