A band called Guff recorded IF YOU WON'T BE MY #1 (#2 ON YOU) on their album "Engine Trouble," Go Kart CD #104, 2003. They're classified as "Punk-pop" according to allmusic. I listened to a sound sample, but it's mostly unintelligible, typical punk-band stuff.

I suspect this title was a joke before it was an actual song.

There are several web sites out there that attribute this, or a song with a similar title, to Roger Miller, but any reputable discography I can find doesn't list it.