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Fat Piece of Shit; a very fat and disgusting person. Someone who blatantly disregards their health and public decency.
Did you see Jerry at the funeral? That FPS brought a bucket of chicken to eat during the eulogy.
FPS by Fatty Fat Fat Sr. March 26, 2020
F(at) P(iece) (of) S(hit)

To be fat and do nothing.
FPS by Joel March 30, 2005
Fudge Packer Syndrome. A common mental state brought on by inserting your penis into too many anal passages.
Mark gercken has come down with FPS boys, i'm afraid he'll have to be kept isolated from men for a few weeks.
FPS by Muzza2k March 10, 2005
Billy: What's his FPS?
Bob: IT'S OVER 9000!!oneoneelevenoneone111!
fps by 4n0nym0us January 11, 2009
Standing for Fapping Promiscuously and Silently

In other words, the condition where you are in a extreme state of sexual arousal, but is in a situation where other people are up and about in an area (such as a house) that you are also currently in. Instead of waiting for all other persons to be asleep or elsewhere, you opt to fap as silently and yet as satisfactorily as possible.
"Hey bro, gotta go, gonna FPS in my room."
FPS by CakeTime November 18, 2011