[TOMT] Song my 4 year old won't stop singing

My 4 year old has been singing a song for the past couple of days. He says the lyrics are something like "I'm a good guy. I'm a nice/night(?) guy. Woohoo." It's a male vocalist. That's literally all I've got to go on. So far everything I've found he's said is not it.

Here's a Vocaroo of him singing it.