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A problem suffered by women on farms after unloading a large amount of hay bales from a vehicle to the barn. Small flakes of hay fall into one's bra and stick there, causing annoyance and the need to do a shakedown of the bra and breastal area.
"Hayboob is something all farmgirls dread. It itches like crazy."
by kitschicat May 13, 2011
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