Green’s Dictionary of Slang

1. (US police) a corpse.

1967		A. Niederhogger Behind the Shield 49: [T]he horror of handling one’s first ‘ripe D.O.A.’ (a dead body that has decomposed after several days in the heat of the summer).
2001		A. Schulman 23rd Precinct 67: ‘Nobody likes to smell a DOA. The smell stays with you’.

2. phencyclidine.

1971		E.E. Landy Underground Dict. (1972).
1981		D.E. Miller Bk of Jargon 337: DOA: PCP.
2001		ONDCP Street Terms 8: DOA — [...] PCP.

3. crack cocaine.

2001

ONDCP Street Terms 8: DOA — Crack.

4. a street name for a variety of heroin.

2001

ONDCP Street Terms 8: DOA — [...] heroin.