Green’s Dictionary of Slang

bust! excl.

a mild excl.; a euph. for damn! excl.

[UK]J. Greenwood Low-Life Deeps 218: ‘Bust and beggar and double bust the blessed threepenny!’ roared the youth rebelliously.
[UK]Marvel III:60 11: Bust! I slipped.
[NZ]McGill Reed Dict. of N.Z. Sl. 40: bust! Exclamation, usually of disgust. Often bust it!, as my grandmother used to say when she dropped her crochet stitch and did not want to say anything stronger such as ‘Bugger it!’ From early C20.