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3.
some kind of baseball slang referring to an unexpected event.

(help me out here UDers.. where did this phrase come from and what does it really mean?)
What happened?
I don't know... it came out of left field.
by Urban Newbie September 06, 2007
 
1.
unexpectedly, suddenly and surprisingly
He just came up with it out of left field.
by The Return of Light Joker July 25, 2008
 
2.
out of left field comes from when wrigley field was first built. In left field there was a insane asylum so when something crazy or unforseen happened it was termed, "out of left field"
What happened?
I don't know... i didnt really expect that, it was just like, out of left field, just crazy it blew me away
by Hugh Jerrection April 08, 2009