Green’s Dictionary of Slang

1. fine, jolly, splendid, esp. when ironic.

1675		Wycherley Country Wife III i: I was quiet enough till my husband told me what pure lives the London ladies live abroad with their dancing, meeting and junketing.
1695		Congreve Love for Love V ii: O I have pure news, I can tell you, pure news.
1704		Cibber Careless Husband III i: Ha! she looks as if my Master had quarrelled with her; I hope she is going away in a Huff [...] This is pure.
1728		Vanbrugh & Cibber Provoked Husband III i: Well, that will be pure!
1880		Henley & Stevenson Deacon Brodie I tab.III iii: O, such manners are pure, pure, pure!
1900–10		Stephens & O’Brien Materials for a Dict. of Aus. Sl. [unpub. ms.] 118: PURE [...] good.. Mostly used in sarcastic sense. To say something very criminal or immoral was ‘pretty pure,’ for instance. Anything impudent, illogical, or irreverent would also be called pure.
2021		T. Swerdlow Straight Dope [ebook] She could give a pure damn for rings, or anything having to do with her crazy family.

2. (UK black) a large number, many.

2015

J. Spades in Guardian 15 Oct. 🌐 Ihe police shut down Rap City [...] Pure videos got lost, I lost millions of views.