Originally used to say "you left the door open", based on the fact that barn doors were left open by farmers to let animals in or out.

More recently, it has been used to simply indicate that a person is ignorant or uneducated as if they were brought up on a farm.
"it's really cold outside and you left the door open! were you born in a barn?"
by savageroyalty February 17, 2010
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1. To have no standards relating to people. To have an open door policy.
2. To be savage of birth, bearing through hell and high water, especially when it comes to cold weather and the raw elements.
3. A Jesus-like figure. Somebody who is perfect, blameless, and performs miracles in astounding ways. They try to see the good in people, however they will be constantly crucified, unjustly, as they try to fit it.
4. Someone who is naive and lacks understanding in social areas, though people would rather not help them.
1. Jason: "Man, why did Jon let these squares come through, they cramping like fuhh."

Andre: "You know Jon, he was born in a barn, he doesn't care who rolls up."
2. Stevie: "It's freezing in here, I can see my breath without even smoking a stogie!"
Josh: "Not everyone was born in a barn, I'll make a fire before the cops show up."
3. Amanda: "I feel antsy tonight, lets round up the squad and crucify us a virgin!"
Nathan: "I know this one guy who was born in a barn, lets fuck his night up!"
4. Guy: "What's a cookie?"
Chick: "What, were you born in a barn or something."
by JaySteeze January 13, 2015
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An expression that can be used in conjunction with put wood in t'oil to tell someone to shut the door
Bob: *Leaves two doors open"
Jim: "Was tha born in a barn? Put wood in t' oil!"
by Proper Sheffield lad July 30, 2021
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