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1.
An acronym used in politics to stand for:

Pugnacity, Mendacity, Sleaze and Harm
PMSH has infected Canadian politics.
by Figleaf23 July 20, 2011
 
2.
pmsh P-pissing M-my S-self H-here pissing my self here
laughing alot at something someone has said or done.
yeah im totally pmsh
by xxallyanderzxx April 19, 2008