Green’s Dictionary of Slang

(US) an individual who performs oral sex.

c.1915–20		in P. Smith Letter from My Father (1978) 78: She was some gobbler. She was [...] inexperienced and was always worried for fear of sucking me off she might get with child.
1934		J.L. Kuethe ‘Prison Parlance’ in AS IX:1 26: gobbler. A degenerate.
1949		Monteleone Criminal Sl. (rev. edn) 102: gobbler [...] a male homosexual.
1950		Goldin et al. DAUL 83/2: Gobbler. (P) A male oral sodomist.
1966		Trimble 5000 Adult Sex Words and Phrases.
1968		(con. c.1900) J. Thompson King Blood (1989) 30: Mothersuckin’ turd, grannygobbler, jismeater, screwing little shit.
1972		B. Rodgers Queens’ Vernacular.
1989		J. Morton Lowspeak 66: Gobbler’s gulch – homosexual rendez-vous.
1992		Bentley & Corbett Prison Sl. 62: Bone Gobbler Someone who performs oral sex.
1997–2000		College Sl. Research Project (Cal. State Poly. Uni., Pomona) 🌐 Fucksauce gobbler {vulgar, probably offensive} (noun) A person who swallows semen from a bodily orifice after it has been produced during an act of intercourse.
1999		Roger’s Profanisaurus 3 in Viz 98 Oct. 15: gobbler n. An eager fellator / fellatrix.
2006		D. Seabrook Jack of Jumps (2007) 3: Duke’s Meadows. They called it Gobblers’ Gulch.
2008		J. Niven Kill Your Friends (2009) 5: Rebecca is tall with full gobbler’s lips. Great legs.
2023		R. Milward Man-Eating Typewriter 137: A fantom-gobbler [...] a who creeps into omis’ bunks after lights-out to suck them off incognito.