When used as a noun, the Jonas Brothers, also known as the Jotards, are a band compiled of three ugly cavemen who try their hands at singing.
However, being unable to speak properly (as they are cavemen going through puberty,) they produce something similar to the sound of a drowning whale.
When used as an adjective, Jonas Brothers may also refer to an unpleasent sight or sound.
(When used as an adjective)
Sam's voice sounded like the Jonas Brothers on stage with a microphone.
Nails on a chalkboard remind me of the Jonas Brothers.
Emerging from the hallway was a horrible man more unsightly than the Jonas Brothers.
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