You need to know the original song to "get" this:-

If you need an incentive to improve your grammar or pronunciation, watch this video:-

If you have problems with phonetics and English pronunciation, imagine the fun you'd have if you needed to pronounce the punctuation in sentences. Thanks to Wlodzimierz Sobkowiak

A spoonerism is an error in speech or deliberate play on words in which corresponding consonants, vowels, or morphemes are switched. spoonerism is

Try to figure out what he is trying to say. Thanks to Marianne.