Where Did Animal-Style Fries Come From? - Tasting Table
Briefly

In-N-Out's fries have gained a controversial reputation for being plain compared to competitors, leading to the popularity of 'Animal Style' fries, which are topped with cheese, grilled onions, and sauce. The term 'Animal Style' itself originated in the 1960s when rowdy customers exhibited unruly behavior, prompting employees to nickname them 'animals.' The first 'Animal Style' offering was actually a burger featuring a mustard-fried beef patty, pickles, onions, and sauce, which became the first secret menu item and later expanded in popularity.
The origin of the name 'Animal Style' fries can be traced back to rowdy customers at In-N-Out who were nicknamed animals by staff due to their unruly behavior.
The first ever Animal Style item was a custom burger made with a mustard-fried beef patty that became a popular secret menu item in the '60s.
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