Green’s Dictionary of Slang

fellatio; cit. 2006 appears to mean a fellatrix.

1997		C. Newland Scholar 32: I asked dat guy for a light an’ he started goin’ on about givin’ him a . . . a shiners an’ all dat shit.
1998		Guardian G2 19 Nov. n.p.: You ask her for a shiner then a slam. And ’cos she’s a domino she’s gonna say yes.
2006		in Sinclair London: City of Disapearances 304: My tag name is cutie and i am a skettel boom a shiner but only shine for there bus fare.