Green’s Dictionary of Slang

balls adv.

(US) extremely, utterly.

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[US]M. Lacher On the Bro’d 108: ‘Can we groom up and chow down up in here? We’re balls tired’ [ibid.] 257: ‘I’m balls-hungry’.
[US]C. Marti Nobody Else But You [ebook] It was balls hot with the unrelenting Santa Ana winds right now.
[US]K. Reus Tempted by Her Neighbor [ebook] It was balls-hot outside and people were [...] out boating and jet skiing.