whatevint.pron.
/wɒtˈɛv/, U.S. /(h)wədˈɛv/, /ˈ(h)wədɛv/ colloquial.
A. int.
Used (typically in response to a question or statement) to indicate that the speaker is disinclined to engage with, or is indifferent to, the matter at hand: ‘whatever you say’, ‘have it your own way’, ‘fine’; = whatever pron. and adj. Additions.
ΚΠ
1992 Richh: Karen says, ‘Love is Zero-Sum Game’ in alt.prose (Usenet newsgroup) 17 Mar. ‘Shubin was the guy's name who did that. Something Shubin.’ ‘Whatev.’
2006 N.Y. Times Mag. 23 July 12/1 ‘Well, I mean, I think Georgetown would be fun,’ I continued. ‘But whatev.’
2017 @KlaraWoldenga 29 Aug. in twitter.com (O.E.D. Archive) Satan: welcome to hell eternal sadness awaits... Me: yea ok whatev.
B. pron.
and (also or) whatev: used after a word or phrase to suggest that another thing of a similar type might be mentioned, or to indicate the possibility of a similar alternative; ‘and (or) something similar’; ‘and (or) the like’.Cf. or whatever at whatever pron. and adj. 4c; whatevs pron.
ΚΠ
1994 Voyager Probe ‘Music’ Disks in rec.music.misc (Usenet newsgroup) 17 Jan. The New Age Cheese shit on the back about ‘healing’ or ‘relaxation’ or whatev should've tipped you..off about where this was coming from.
2008 @willrix 13 May in twitter.com (O.E.D. Archive) Cooking and whatev.
2018 @bryancumpler 8 Sept. in twitter.com (O.E.D. Archive) Ordered a Caramel something. Macchiato or whatev.
This is a new entry (OED Third Edition, September 2019).
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int.pron.1992