Green’s Dictionary of Slang

dead meat n.

[lit. or fig. uses of SE]

1. [mid-19C+] someone who is facing certain death; also in fig. use.

2. [late 19C+] a corpse.

3. [late 19C+] a prostitute, esp. an older woman.

4. [20C+] a horse that has no chance of winning a race; thus dead meat market / shop, a race in which the bulk of contestants are thus characterized.

5. [1900s] (Aus.) in attrib. use of sense 4.

6. [1960s] the flaccid penis.

7. [1980s+] a stupid, dull person.

In compounds

dead-meat ticket (n.) (also meat ticket) [SE ticket; orig. milit. use, such tags identified the corpses of otherwise anonymous soldiers]

[1910s+] (Aus./N.Z.) an identity tag.