Green’s Dictionary of Slang

lughole n.

an ear.

1943		M. Harrison Reported Safe Arrival 126: An’ if I ’as any lip from these ’ere Sarf Africans, they’ll git a clip rahnd the lug-’ole.
1959		A. Sinclair Breaking of Bumbo (1961) 134: Duty be damned, says Sarnt James, and lands him one on the lughole.
1965		E. Bond Saved Scene vi: Right in the lug ’ole.
1979		F. Norman Too Many Crooks Spoil the Caper 178: He gave me the full Oxbridge right in the lughole.
1981		J. Sullivan ‘The Russians are Coming’ Only Fools and Horses [TV script] I’ll have one with three lug ’oles and the eye underneath her arm.
1999		Guardian 24 Sept. 22: At a burst of Hadley’s [...] tones, that morbidly compelling period of the early 80s rears in the mind’s lughole.
2007		Indep. 16 May 30/6: You’re giving me GBH of the lughole.

In phrases

pin back one’s lugholes (v.)

to give one’s full attention .

1954		Oh Boy! No. 23 10: Pin back your lug’oles, Folks!
1977		D. Francis Risk 12: Well, mate, pin back your lugholes. That boat you were on was built at Lymington.