Green’s Dictionary of Slang

ball-busting adj.

1. (US gay) extremely sexually arousing.

[US]‘P. Pepper’ In Tight Twins 60: [B]eing penetrated, being split open by the powerful male animal, horny with aching, ball-busting lust [Simes:DLSS].
[Aus]Capital Q (Sydney) 21 July 46/1: Cazzo Films certainy know how to overflow their titles with raunchy, ball-bustin’ men [Simes:DLSS].

2. see ball-breaking adj.