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1.
"Animal Style" refers to a food alteration which can be ordered at the West Coast's famous In-N-Out Burger restaurant chain. The term is not officially listed on the menu, but instead is part of the Secret Menu. If applied to a burger, the meat is grilled with mustard, with sauteed onions, pickles, and extra spread added. If applied to fries, it comes with melted cheese, sauteed onions, and spread.
What can I get for you?

I want a Double Meat Animal Style, Animal Fries Extra Cheese, and a medium lemonade!
by Stevo January 08, 2005
 
2.
Term at In-N-Out Burger used to order a hamburger which is fried in mustard.
I'll have a Double Double animal style.
by octavius March 10, 2004
 
3.
To do something naked, like an animal would, without clothes on.
Stewart went to the beach animal style, but he got arrested for indecent exposure.
by xamaryllix February 13, 2011