Green’s Dictionary of Slang

arsehole crawl v.

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

[late 19C+] to grovel unashamedly, to play the sycophant.

In derivatives

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

[late 19C+] a sycophant; thus a general term of abuse.