cag, n. — Green’s Dictionary of Slang

cag n.

[dial./RN slang cag, an argument]

sulkiness, ill humour.

1823		‘Jon Bee’ Dict. of the Turf, the Ring, the Chase, etc. 20: Cag the Sulkiness, out of humour.
1877		‘Comical Incidents’ in Laughing Songster 62: As Betty Crump had ta’en the cag / I think the sex all flam.

carry the cag (v.)

to be easily irritated, to lack a sense of humour, esp. as regards jokes against oneself.

1811		Lex. Balatronicum n.p.: Cag. The cove carries the cag; the man is vexed or sullen.
1823		‘Jon Bee’ Dict. of the Turf, the Ring, the Chase, etc. 20: A ‘cove who carries the cag,’ speaks seldom.