fireman's flap
In real, traceable use. Part of the curated seed collection; community review is coming.
Meaning · English
The flap for defecation in a union suit.
Register: slang
Where it’s used:
Used
American English
Sources & notes
Adapted from English Wiktionary (CC BY-SA 4.0, retrieved 2026-07-30 via kaikki.org).
Common questions
What does “fireman's flap” mean?
The flap for defecation in a union suit.
Is “fireman's flap” formal or informal?
fireman's flap is generally slang.