Green’s Dictionary of Slang

(US) a toady.

1900–10		Stephens & O’Brien Materials for a Dict. of Aus. Sl. [unpub. ms.] 146: SUCK, OR SUCKHOLE OR SUCK-ARSE: a low-down cringing sycophant.
1957		T.T. Chamales Never So Few (1958) 218: Lieutenant Ringa, King of the Suck-Asses. They’re using him.
1968		G. Cuomo Among Thieves 290: Some suck-ass that didn’t know an exhaust pipe from an ignition key.
1986		S. King It (1987) 214: ‘Suckass,’ Henry Bowers remarked under his breath.
1992		R.G. Barrett White Shoes 234: Crystal was looking up at him like [...] he was the greatest suck-arse God had ever put breath into.
2002		(con. 1998–2000) J. Lerner You Got Nothing Coming 137: On-the-leg piece a shit! [...] Warden-jeffing suck-ass! [...] Punk-ass stanky-on-the-hang-low bitch motherfucker!
2009		(con. 1960s) J. Ellroy Blood’s a Rover 20: Why should Howard Hughes go outside his own organization full of suck-asses he feels comfortable with.