And exclamation somewhat similar to “oh my god” and “by Jove
Holy Roman Barn Owl is used exclusively as an exclamation of shock, outrage, horror or surprise such as in the following example:

Nick: Boris has withheld food from millions of the countries poorest children!
Jon: Holy Roman barn own!! What a total shit show!
by Rathgam December 04, 2020
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Did you have sex with my barn owl is what to ask when you find your barn owl at the neighbor's, dressed in gaudy lingerie and smelling of cheap booze and jizz.

A positive answer can wreck a barn owl's reputation.
Frontenac was obliged to ask, "Did you have sex with my barn owl?" when he found "Barney" at his neighbor's in a compromising position.

He was extremely relieved to hear the answer, "No, we just got to third base."
by scodder May 14, 2010
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A barn owl is a lazy farm worker, who instead of doing the job s/he agreed to be paid to do, is likely to be found sleeping in the barn.
I'm tired of hiring teenagers to help work this farm with me only to find out they want to be highly paid barn owls!
by Lacemaker427 September 07, 2018
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The act of sneaking up behind someone and holding their head before turning it 180 degrees in the opposite direction, in a manner not unlike a barn owl swings it's head around in a single sweep.
Jack got barn-owled this morning in the ring.
by Gray Nightshade May 27, 2021
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