I want to know

I realize I'm late to the party on this one but can someone please tell me what the hell this is all about?

My sister showed me a hilarious video of two guys singing this song over the weekend but I can't find it. So this will have to suffice.

I'm sorry in advance to doing this to you.

But really, is this a joke?

And if it isn't, how the shit do I not have a single on iTunes?