The asparagus booth is the toilet or urinal stall whose previous user has recently urinated following a healthy portion of asparagus.

Archaic: A mythical architectural feature in the castles of old Europe in which small chambers accessible from the dining hall permitted nobles to luxuriate in the intoxicating aphrodisiac of the asparagus flowers wafting from their urine pots.
Awww man, I totally got the asparagus booth in there. That urinal was a veritable detective's steam grate of asparagus fumes.
by K P Cogs November 20, 2013
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