Green’s Dictionary of Slang

arse lick n.

also ass lick

(orig. US) a toady, a sycophant, a groveller.

[US]J. Olsen Secret of Fire Five 146: He’s Steicher’s biggest ass-lick, but not a bad guy when you can get him alone.
[UK]I. Welsh Filth 268: Arselick Lennox in Toalie’s office.
Fade In mag. [Internet] Maybe some ratbag producer will say, ‘Hey, that asslick is your agent? I’ll have him send me one of your scripts.’.