Green’s Dictionary of Slang

(US) a gob of expectorated phlegm.

1997		C. Hiaasen Lucky You 200: Chub launched a gooey hawker over the windshield.
2001		R.T. Wilson Black Bridge 56: Jeff spat a hawker .
2013		B. Warny Women in Prison [ebook] He drew up a hawker and spit it onto his hand and rubbed it on the woman.