No, milk is not the secret behind the amazing unibrow Jimmi Simpson rocks every time he guest stars as Liam McPoyle on “It’s Always Sunny in Philadelphia.” In fact, the FXX series puts a great amount of time and effort into sculpting the hairy masterpiece.

Well, at least they used to.

Simpson recently appeared on PeopleTV’s “Couch Surfing,” where he watched clips of his memorable appearances as one of the members of the McPoyle clan who torment the gang at Paddy’s Pub to no end. When the host asked about his signature unibrow, which is clearly not Simpson’s own facial hair, he explained how it is applied.

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“It’s actually a f—ing weave,” Simpson said, laughing. “I don’t know if they cut the unibrow budget, but I used to have each hair placed like Brundlefly, like these thick, coarse mother bangers across.”

Well, to be fair, they probably have to reserve some funds for all the beer and wine in a soda can the cast has downed over the years. On camera, of course.

Watch the full clip below.

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