The act of pressing the penis and testicles to a glass window (or any other transparent substance) to create the outline of a squished mouse.
"So, did you moon her?"
- "No, man. One better, I gave her the flat rat".
by mookie12 May 25, 2006
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A condition when hamsters are VERY happy and relaxed with their human friend.

First, they have to trust their human as a personal presence. Then, they have to trust that their human friend isn't going to suddenly become aggressive toward them.
then all you have to do is to pet them on your hand until they become flat.
bro you're hamster is a flat rat
they must be very happy and relaxed!
by YukioKoito January 1, 2022
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The people not good enough to live in the Jew neighborhoods of Woodbridge. Prime example: Saldi Hyska
by Westieaboutit May 6, 2017
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