Police prisoner transport vehicle. Also black maria or paddy wagon.

This is the spelling used in the Tom Waits song "Big Black Mariah":
"Here come the big black mariah, here come that big black Ford"
by seajay October 30, 2005
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another term for drugs, preferably marijuana.
"yo dude, got any big black mariah on you?"

"yeah man, let's go jam!"
by Topse Crets April 9, 2009
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A term used for a police vehicle, usually a Golden (or Classic) Age Ford or Chevy.
Tom Waits has a song called 'Big Black Mariah' - it's all about being chased by the police. An excerpt;

"Here comes the Big Black Mariah,
I seen the big black Ford"

And Nick Cave mentions that the character in 'The Curse Of Milhaven' is driven;

"Off to the the asylum'
In an Old Black Mariah"
by Frank Rider August 22, 2009
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