shoving one's fist up one's ass. Similar to fisting only a funnier word.
hey sailor... wanna go home and arm barn me?
by foofykitty May 24, 2006
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"hey did you know those dog killers peta want to change the bullpen's name to arm barn lmao"

"wait you mean fisting"
by jevsal2 October 29, 2021
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A arm barn is the southern term for a circle jerk. Where a group of good ole boys get together to jerk each other off in a circle. An arm barn tends to be more rough than a circle jerk on account of all participants having blue collar jobs, thus leading to hands that know a hard day's work.
After working a hard day down at the mill, Brady was looking forward to getting together with the boys for a good old arm barn later.
by DancesWithPandas October 29, 2021
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