Green’s Dictionary of Slang

(US) gonorrhoea.

1935		McCleary & Anderson Not For Heaven 194: ‘Have any of you guys ever had the syph?’ Cotton Sack said. ‘I’ve had the gon.’.
1945		Mess Songs & Rhymes R.A.A.F. 1939-45 29: He must have been riddled with sypho or gonna.
1963		V. Packer Alone at Night 72: In charge of syph and gon [HDAS].
1972		B. Rodgers Queens’ Vernacular 205: case of gonorrhea [...] gonny.
a.1982		D. Laycock Best Bawdry 99: Now he’s gone to a land of everlasting bliss,/ where there ain’t no gono and there ain’t no syphilis [Simes:DLSS].
2003		K. Cage Gayle 73/1: Gonnie n. gonorrhoea.