Green’s Dictionary of Slang

royal adv.

completely, comprehensively.

[US]J. Rechy City of Night 196: I dont give a damn how cool you think you are, youll get Caught and get Caught royal.
[US]L. Heinemann Paco’s Story (1987) 24: He knew he was fucked-up royal.
[US]C. Hiaasen Skin Tight 177: That asshole in Queens had screwed him royal.
[US]C. Hiaasen Strip Tease 181: ‘He screwed up your roach case.’ ‘Royal.’.
[US]J. McCourt ‘Vilja de Tanquay Exults’ in Queer Street 305: I was adopted [...] / So I qualified roy’l.