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1.
Simple contraction of "pretty much" that when used properly, makes for a comical and surprising response to an appropriate statement.
Kid: "Dude, you're really cool!"

Conceited kid: "Pmuch."
by lol1245807 June 17, 2010
 
2.
Shortening of pretty much.
"So it turns out that Jesus is a straight up badass."
"yeah p much."
by portaparty March 12, 2013