Green’s Dictionary of Slang

(Aus./Can./US) to toady, to curry favour; thus suckholing adj., toadying.

1966		F. Elli Riot (1967) 86: They’re suck-holing around the hostages, treating ’em like kings. [Ibid.] 127: The suck-holing fink.
1969		F.B. Vickers No Man is Himself 72: ‘I know yous, yous bastard. You’ll suckhole to him. Give it to him straight,’ he shouted [AND].
1996		spokesman for Ontario Militia, posting at Canadian Firearms Digest 🌐 Just as predicted, the Senate was too crooked and gutless to make a stand against this totalitarian piece of legislation. Having neither balls, character nor spine, the senators rolled over, suckholed and caved in.
2001		posting at ABC (Aus.) Forum 25 Apr. 🌐 Ever seen Costello and Packer together on T.V. Costello is the biggest suckholing, panlicking, brown-nosing twerp of a pollie I’ve ever seen.