Green’s Dictionary of Slang

gobbler n.2

also bone gobbler
[SE gobble/gobble v.1 (2)]

(US) an individual who performs oral sex.

[US] 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.
[US]J.L. Kuethe ‘Prison Parlance’ in AS IX:1 26: gobbler. A degenerate.
[US]Monteleone Criminal Sl. (rev. edn) 102: gobbler [...] a male homosexual.
[US]Goldin et al. DAUL 83/2: Gobbler. (P) A male oral sodomist.
[US]Trimble 5000 Adult Sex Words and Phrases.
[US](con. c.1900) J. Thompson King Blood (1989) 30: Mothersuckin’ turd, grannygobbler, jismeater, screwing little shit.
[US]B. Rodgers Queens’ Vernacular.
[UK]J. Morton Lowspeak 66: Gobbler’s gulch – homosexual rendez-vous.
[US]Bentley & Corbett Prison Sl. 62: Bone Gobbler Someone who performs oral sex.
[US]College Sl. Research Project (Cal. State Poly. Uni., Pomona) [Internet] 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.
[UK]Roger’s Profanisaurus 3 in Viz 98 Oct. 15: gobbler n. An eager fellator / fellatrix.
[UK]D. Seabrook Jack of Jumps (2007) 3: Duke’s Meadows. They called it Gobblers’ Gulch.
[UK]J. Niven Kill Your Friends (2009) 5: Rebecca is tall with full gobbler’s lips. Great legs.