The spelling of the phrase "more cowing" may appear confusing to some, as the word "cowing" is not a commonly used verb. However, the pronunciation of the phrase is more easily understood with the use of IPA phonetic transcription. "More" is pronounced /mɔːr/, with the long vowel sound of "o", while "cowing" is pronounced /ˈkaʊɪŋ/, with the diphthong "ow" sound. When spoken together, the phrase is pronounced /mɔːr ˈkaʊɪŋ/ and simply means to engage in cow tending or farming activities.
There is no word "more cowing" in the English language. However, it seems like you might be referring to the phrase "more cowbell", which gained popularity through a sketch on the American comedy show "Saturday Night Live" in 2000. The phrase itself has no specific etymology, but its meaning is rooted in the use of a cowbell as a musical instrument. In the sketch, the cowbell is humorously exaggerated as a way to emphasize its importance in a music recording, which has since become a reference to the need for something extra or exaggerated in a particular context.