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Having inroduced 'FOBYAC' into to Urban Dictionary and wishing to retain somewhat of a theme, I now provide you with a second wonderful acronym, 'MFPOS'.

If, (when), used in open forum, calling someone a 'Mother Fucking Piece Of Shit' may provoke undue tension amongst those present, not least in the person towards whom 'MFPOS' has been directed, but again and with a degree of delight, once can openly verbally abuse a fellow human being, (perhaps one who is a complete tosser, whilst hiding securely behind the complete and total anonimity of these few choise letters........MFPOS!
Introduced subtly into every-day conversation, one may employ MFPOS in the following manner:

Covertly: "Excuse me, Sir, you're a MFPOS"
Enraged: "Oy, shithead, you're a MFPOS!!"
Questioning: "Tell me, are you a MFPOS?"
MFPOS by Drofnas Trebor June 5, 2007
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Multiple POSitions available during time spent with an escort.
"I got MPOS with her, cowgirl & doggie."
MPOS by Dyvine July 22, 2006
Related Words
MFPOS Mfposgbcs MPOS mposto mupos mfpol MFPOTLY mfpotp MFPS Actin' Bitch mmPOS
Most
Useless
Piece
Of
Shit

Plural mupoi
Wow Matt you are such a mupos.
mupos by hi im bitch August 30, 2004

wait a minute mrpostman 

the dankest of all memes and will be forever rememberd
wait a minute mrpostman
wait a minute mrpostman by d4 lapse November 11, 2017
hanging out with a transsexual of a dude with a small penis usually at the same location( back of a illegal car)
with leo, we was mposted my G, yh yh
mposted by okpsuden May 1, 2017
MPOS = on her knees, face fucking, cock in mouth, balls on chin, balls on nose, her head hanging off bed upside down and him face fucking her mouth, etc.
MPOS by DudePiston December 12, 2012

MFPS Actin' Bitch 

This phrase is the Ebonics turned 'word' for 'Mother Feather Plucker Syndrome'!

See 'Feather Plucker' and 'Mother Feather Plucker Syndrome' in the Urban Dictionary for the complete low down!
I said, get out of that smoke-filled bathroom with that baby, you MFPS actin' bitch!
MFPS Actin' Bitch by gravy111 November 22, 2010