Top Definition
The official acronym of the Piece Of Sh!t Of The United States.
"The POSOTUS gave a briefing on the Healthcare Plan today, and the people are rising up against it."

"The POSOTUS returns salutes in kind of a weak wristed way, what a fag"

"The 'Dear Leader' is really just a POSOTUS."
by PrinceAlTheManBearPig August 13, 2009
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