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1.
From the chess-related movie Searching for Bobby Fischer. The correct spelling is actually "patzer," and it's a derogatory name for a weak player. The term was revived in the Kevin Smith film, Chasing Amy
Don't be a complete fucking potzer like you were last night
by BankyTheHack April 24, 2003
 
2.
a person who does or says something to make a fool of himself.
Man, stop jumping around. You look like a potzer.
by Weaver March 19, 2004
 
3.
A person who plays for traps in a game of chess.
That potzer got me with a cheap opening trap.
by Robert J. Fischer September 25, 2003