Green’s Dictionary of Slang

arer adv.

[a fake ‘comparative’ of SE are; see cit.]

more so, to any greater extent.

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[UK]J. Ware Passing Eng. of the Victorian Era 9/2: Arer (Peoples’). More so. From ‘are’, emphatically used. ‘We are, and what’s more, we can’t be any arer.’.