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1.
A bowel movement characterized by loud grunting, deep exhale noises and an awful odor. Derived from old men who have no shame in public bathrooms who just let it go no matter who is the bathroom during or after.

-- often happens to mid 20s men who had too much to drink the night before. (Similar to beer shits but worse)
Dude, I just totally old manned the toilet in the bar!
by MikkBretly February 24, 2011