adj. (public schools).Stuck up; conceited; impudent.
1856. T. HUGHES, Tom Browns School-days, I. ix. p. 202. Hes the COXIEST young blackguard in the houseI always told you so. Ibid., p. 214. Confoundly COXY those young rascals will get if we dont mind, was the general feeling.
1882. T. A. GUTHRIE (F. Anstey), Vice Versâ, ch. iv. Now then young Bultitude, you used to be a decent fellow enough last term, though you were COXY. So, before we go any furtherwhat do you mean by this sort of thing?