Jimmy Fallon & Backstreet Boys Sing 'The Thong Song' As Barbershop Quartet

"She had dumps like a truck... truck... truck..."

Doesn't matter what generation you grew up in, Sisqo's "Thong Song" is an undeniable booty-shaking anthem. But imagine mixing those lyrics with a barbershop quartet style, LOL... now imagine it's the Backstreet Boys and Jimmy Fallon doing the singing, haha.

The 6 guys showcased their best live vocal on The Tonight Show on Tuesday night and here's the end result:

 
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