Green’s Dictionary of Slang

1. (orig. Aus.) disappointed, betrayed, esp. sexually.

1956		Argus (Melbourne) 13 Mar. 7/5: The Queen of Moomba, 19-year-old Fay Chapman, was really ‘burnt up’ last night — because she wasn’t asked to speak after being crowned.
1968–70		Current Sl. III–IV (Cumulation Issue).

2. emotionally drained.

1989

P. Munro Sl. U.

3. (also burndt) embarrassed.

1984		Eble Campus Sl. Mar. 1: burnt – embarrassed : Brenda was burnt when she fell up the stairs.
1986		Eble Campus Sl. Oct. 2: burndt – thoroughly embarrassed (n-d-t prolonged and pronounced).

4. (also burnt out) physically exhausted.

[1881		Trumble Sl. Dict. (1890) 10: Burnt out. Worn out roués; played out].
1982		Eble Campus Sl. Spring 2: burnt out – worn out, exhausted.
1997–2000		Da Bomb 🌐 5: Burnt: Worn down. Tired.
1999		Guardian Weekend 14 Aug. 3: He appeals to people who are foul-mouthed, burnt-out and who will never produce anything of worth.

5. mentally impaired from drug use.

1996

Eble Campus Sl. Sept. 2: burnt – mentally muddled because of excessive drug use.