Is Busted a Proper Word?

calls this usage informal, and the Oxford English Dictionary labels it colloquial (that is, more suited to speech than writing). ... However, some other meanings of “bust” and “busted” are more widely accepted and can be used without apology in writing as well as speech.

Is it busted or burst?

Bust, meaning "burst or explode," and busted are nonstandard. Use burst instead. Burst is the same in the present, past, and past participle.

Is Busted formal or informal?

Informal. broken, fractured, or seriously damaged: a busted leg.