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1.
When a man has his fly open and visible
Dustin: Hi guys!
Kendra: Dustin your barn door is open.
Dustin: Thanks (zips).
by WorthyWorthington September 02, 2013
 
2.
The act of parting one's bangs down the middle, thus making the shape of a barndoor.
Andrew frequently wore a barndoor and thought it was stylin'.

When people have a barndoor it makes me want to slap their forehead.
by Cornfused January 10, 2011
 
3.
vb. 1. the act of purchasing an item at a reduced price before the real value has restored to potentially make a profit.
n. 2. an item purchased before the real value has restored.
Jon believed that barn dooring as many players as possible would hide the fact he knows nothing about football because he is gay.
by Renziek November 13, 2010
 
4.
implying that someone is as ugly as a farmyard animal
someone forgot to close the barn door!!
(said in a bitchy camp voice)
by missy mary May 03, 2003