Green’s Dictionary of Slang

1. (US) a large, thuggish man.

[1694		Congreve Double-Dealer V ii: Fool! sot! insensible ox!].
1850		Lancs. Gaz. 12 Jan. 4/4: It is the fashion to compare out agriculturalists to ‘clods’ and ‘oxen’, but in our opinion the Conservatives were but a beef-witted class.
1885		Mrs J.H. Riddell Mitre Court II 104: Take that great ox John Jeffly—he thinks no more of me than he did when I had not a notion where to turn for sixpence.
1931		in R. Butterfield Sat. Eve. Post Treasury (1954) 308: Look out, yer clumsy ox!
1947		B. Schulberg Harder They Fall (1971) 105: This ox — [...] he’s nothing.
1952		J. Jones From Here to Eternity (1998) 791: Neither was it a pleasant thought to know your Company Administration was being strangled by the sausage fingers of a stupid ox like Baldy Dhom.
1960		I. Freeman Out of the Burning (1961) 204: The ox crushed my fingers with his handclasp.
1983		N. Proffitt Gardens of Stone (1985) 242: I thought that dumb ox had finally cottoned on.
1994		J. Wambaugh Finnegan’s Week 140: He understood that the ox was using insolence to show a lack of concern.

2. (US teen) an unattractive, overweight female.

1968

H. Sebold Adolescence 250: Girls are judged very harshly. The girl who is pegged as a scab, a shank, a bat, or an ox may be shattered forever.

3. (US black) a razor blade; a Stanley knife [? SE box cutter].

1993		Mobb Deep ‘Locked In Spofford’ 🎵 .
1998		Big L ‘Ebonics’ 🎵 A radio is a box, a razor blade is a ox.
2003		Children of The Corn ‘I Remember When’ 🎵 Ox or box cutter, yo, whatever one that they choose.
2012		Wu-Tang Clan ‘Six Directions of Boxing’ 🎵 Hand made ox’ll get you duffed in the mess hall.
2018-20		T. Thorne (ed.) ‘Drill Slang Glossary’ at Forensic Linguistic Databank 🌐 Ox - razor, blade.