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A happy song is a tune that makes you want to shake your butt like a maniac, even if you're stuck in traffic with a f***ing idiot in front of you.
I was stuck in traffic for an hour, and this song made me laugh so hard I almost peed my pants.
My mom started singing it in the grocery store, and the guy behind me yelled, 'Just f***ing dance already!'
I played it at my dog's birthday party, and my dog started doing the cha-cha.