whatevsint.pron.
/wɒtˈɛvz/, U.S. /(h)wədˈɛvz/, /ˈ(h)wədɛvz/ 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’; = whatev int., whatever pron. and adj. Additions.
ΚΠ
1996 alt.skate-board (Usenet newsgroup) 11 May (title of posting) Lame post..whatevs.
2003 Toronto Star (Nexis) 18 Jan. c2 Ashlee Simpson needs a lil' help? Ah, whatevs, she's only a kid. Cut her some slack.
2016 J. R. Brown Georgia Peaches & Other Forbidden Fruit xi. 115 ‘I promise I'll call you back.’ ‘Whatevs, see you.’
B. pron.
and (also or) whatevs: used after a word or phrase to suggest that other things of a similar type might be mentioned, or to indicate the possibility of similar alternatives; ‘and (or) something similar’; ‘and (or) the like’.Cf. or whatever at whatever pron. and adj. 4c, whatev pron.
ΚΠ
1996 Fashion in alt.skate-board (Usenet newsgroup) 2 Apr. It seems lately everybodie has been sweating fashion and whatevs.
2005 Contra Costa (Calif.) Times (Nexis) 29 Dec. f4 Let's go cruisin' or whatevs.
2018 @giandujakiss 26 Sept. in twitter.com (O.E.D. Archive) You can argue she's lying or exaggerating or whatevs.
This is a new entry (OED Third Edition, September 2019).
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int.pron.1996