Green’s Dictionary of Slang

an unpleasant youth, usu. as described by a social superior.

[1925		Dict. Bootham (School) Sl. n.p.: Hoick, [...] spit. Oick, [...] to spit; abbreviated form of ‘oickman’. Oickman, [...] labourer, shopkeeper, etc.; also a disparaging term.].
1933		A.G. Macdonell England, their England 95: Those privately educated oicks are a pretty grisly set of oicks. Grocers’ sons and oicks and what not.
1948		C. Day Lewis Otterbury Incident 91: I mean, why did Johnny Sharp drive off the oicks who were following the concert party round?
1958		Willans & Searle Complete Molesworth (1985) 7: Milksops greedy guts and oiks with whom i am forced to mingle.
1969		A. Buckeridge Trust Jennings (1989) 34: I can’t go myself or some rotten oik will pinch my seat.
1973		A. Buckeridge Speaking of Jennings (1989) 123: It’s those mouldy oiks, Binns and Blotwell.
1983		(con. 1940s) D. Nobbs Second From Last in the Sack Race 88: Her face was scarlet with fury. ‘No thanks to you, you ... you bloody oik,’ she said.
1999		Guardian G2 25 June 12: If an oik can get a job at blue-blooded Barings, what is the point of Eton, dear boy?
2001		Indep. on Sun. Reality 21 Jan. 9: What every spotty little oik in Britain can do.
2012		T. Blacker Independent 16 June 🌐 It had to be Frank. Who else would use that old-fashioned public school insult ‘oik’?