The buttoned or snapped flap at the rear of a union suit — the old-school one-piece long underwear favored by laborers and working men. Called the "fireman's flap" because firefighters and other tradesmen wore union suits under their work gear and needed quick access without stripping down. Now a nostalgic, mildly humorous term evoking cold-weather Americana and vintage workwear culture.
Grandpa still swears by his union suit and says the fireman's flap makes winter barn chores way less miserable.
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(slang) The flap for defecation in a union suit.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
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