rebeccawdavidson above has the correct information. It's Czech, but most native speakers don't know the song at all, because it is explicitely bawdy. A group of Czech Boy Scouts writes they sang it when drunk - unfortunately, they don't write down the lyrics.

The parts "... pumpa ... pum, pum, pum" reveals some relationship to the song "Stará pumpa", as has been pointed out in another thread (stará translates old). The tunes, however, are quite different. The one for "Stodola pumpa" resembles a folk dance.

The career of the song in the USA is remarkable! My idea is that children of Czech immigrants sang it to their teacher to make fun of her/him.

Rebecca, please try to wrinkle out the lyrics from your friend (use some Plzen beer).