1: A water drainage pipe under a bridge to dead drop "questionable packages" when out of monsoon season.
2: Known as an alcantarilla in Spain, they are known to be quite majestic to walk around.
3: A Dutch word for crotch rot.

The origins of the word has been speculated to have Dutch or French origins and definitely not majestic Spanish.
Hank - I mean, you ever hear anyone walk around the majestic culverts of Spain?
Gomez - Who the hell goes around talking about majestic culverts?
by WooskiBroski May 22, 2023
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Noun. A device that turns naturally occurring water ways into managed systems that require maintenance and can potentially cause great harm to the environment.
"Did you see all those brook trout trapped downstream of that culvert?"
by Sickter6 February 6, 2013
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Like a tunnel buddy, a culvert buddy is someone who has sex with the same young girl.
"I can't believe Trump and Obama raped the same 9 year old girl. After all the argued about who would have thought they would end up culvert buddies."

"Eh, I'm not surprised raping children and war are the two things they agree on."
by BidenHelpsObamaRapeChildren September 1, 2021
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