The Manhattan fast-food joint where an Australian tourist was stabbed in a terrifying, unprovoked attack Monday is an infamous hangout for shady characters — earning it the nickname “Murder McDonald’s.”

The McDonald’s at 490 Eight Avenue, which is open 24/7, attracts a seedy clientele, including drug dealers, thugs and junkies from a nearby methadone clinic, after hours, they told The Post.

“It’s like a f—ing nightmare,” said one clinic patron named Toaster, 45, adding that he eats at the restaurant about once a week.

“It’s a murder McDonald’s. They do whatever they want here. It’s like a little slice of hell because you can get whatever you…

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