Top definition
A large criminal plan. Usualy organised while spending time in jail for another crime.
"I got this plan for a big dirty after I get outta here"
by zoobtoob December 07, 2006
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2
Something so awesome and cool, yet gross and greasy.
"Dude, that body suit is old and smells funny..." "WHATEVER, ITS THE BIG DIRTY"
by Nazzy Man and EChris December 13, 2009
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3
An enormous and/or monstrous poopie that is taken in the morning after a long days digestion.

To best encourage a successful Big Dirty one must recite "Big Dirty" multiple times. How loud one can say "Big Dirty" is up to the speakers discretion. This repetition can also be used to invite others to perform a successful Big Dirty.

Reciting "Big Dirty" can also be used to set an uncomfortable tone in any crowded restroom, public or private.
Stall 1: "Big Dirty, Big Dirty, Big Dirty"

Stall 2: Inhabitant leaves the restroom due to uncomfortable atmosphere.
by The Big Dirtier November 13, 2010
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4
Let's do a Big Dirty before the concert
by --Mick-- November 20, 2005
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5
A girl with a nice face, but a heavy build. May also be considered as girl who is just fat, or a girl who is fat and ugly.
That girls a Big Dirty, or Toms girlfriend's a Big Dirty or BIG DIRTY!
by yourmom647 March 29, 2011
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6
Common Nickname for Chief Perkins. Sounds far better than biker trash.
Did you see that sweet sweater big dirty was wearing???
by VFA-83LINERATS December 18, 2009
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7
Used to describe a two liter bottle of cider.
What do you want from the off licence?
A big dirty mate!
by Rycy May 09, 2008
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