From Wiktionary, the free dictionary
From burne (“testicle”).
burné (feminine burnée, masculine plural burnés, feminine plural burnées)
- (slang) manly, virile
- (slang) ballsy, daring, bold, courageous
- Synonym: (vulgar) couillu
Il faut être sérieusement burné pour faire du wingsuit !- You've got to have serious balls to go wingsuit flying!