'Walking Dead' Star Norman Reedus Finally Explains Why He Licks People

In the world of "Walking Dead," an even bigger threat than the zombies is whether or not Norman Reedus has brushed his teeth.

The actor, famous for playing the crossbow-wielding Daryl Dixon, is also known for licking castmates, fans, monuments and pretty much everything he can. At this point, his name has even become a term on Urban Dictionary for licking someone's face.

On Tuesday, Reedus finally explained to Conan O'Brien how it all got started. He also recalled a weird fan experience involving rubber horse heads that amazingly makes licking seem pretty normal.

"The Walking Dead" airs Sunday at 9:00 p.m. ET on AMC.

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