When I originally heard this song - so long ago I can't remember where or by whom- I distinctly remember however that I heard it as BLISS young buy a broom which made no sense at all and I assumed was a mishearing.
Last week, however, when persuing one of my favourite hobbies i.e. browsing in secondhand book shops I found the Penguin Dictionary of Curious and Interesting Words which included
"BLISSOM" - bleating with sexual desire
"Blissful Mr. Thimm danced blissom Miss Swint squealing over a ha-ha....    Theroux, Darconvilles Cat p.214

Well it makes sense to me!