As will be later revealed (http://www.infiniteulysses.com/ulysses/321), these Ahs and ows are sound effects which accompany the urination of our gonorrheic unnamed narrator. David Hayman proposes that at least this part of the tale of Bloom in the Cyclops' sordid den is being recounted by the speaker and his auditor(s) while both are engaged in pissing.
