A sexually indiscriminate woman; a slapper. A conflation of the word
jizz with '-oon', to evoke a spitoon, as it were, for glob.
Like the cuspador, a place you can release problem fluids where spitting them at the
wall isn't a graceful option.
I found half a dozen foil wrappers and a
pack of
gonorrhea pills in Trish's handbag again. That
bitch is a Forrestal-class jizzoon.