Green’s Dictionary of Slang

arsehole crawl v.

also arsehole creep
[ext. of arse crawl under arse n.]

to grovel unashamedly, to play the sycophant.

[UK]K. Bonfiglioli Don’t Point That Thing at Me (1991) 40: They watched him bully and arsehole-creep his way up the service.
[UK]Partridge DSUE (8th edn) 27/1: late C.19–20.

In derivatives

arsehole-crawler (n.) (also arsehole-creeper, arsel-creeper)

a sycophant; thus a general term of abuse.

[UK]P. Fordham Inside the Und. 93: There’s only one word for him [...] Arsel-creeper.
[UK]Partridge DSUE (8th edn) 27/1: arsehole crawler or creeper [...] late C.19–20.