Disco Girl

Disco Girl is a "Top 40" hit girly song by Icelandic pop group BABBA that Dipper enjoys singing, as revealed in Dipper vs. Manliness. Later on in the episode, the Multi-Bear acknowledges that it is his favorite song, persuading Dipper to change his mind about killing him and accepting his own form of masculinity.

Lyrics
Disco girl, coming through

That girl is you

Ooh ohh, ooh ooh

Trivia

 * The song and band is a spoof of real world Swedish group ABBA and their song Dancing Queen.