Green’s Dictionary of Slang

dog it v.1

[dog v.1 (3a)]

1. [20C+] (orig. gambling, also dog) to act weakly, to be a loser, to lack winning spirit.

2. [20C+] (US) to shirk, to waste time, to hang back.

3. [1920s+] (US) to dawdle, to go slowly.

4. [1920s+] (US) to malinger, to act lazily.

5. in sexual contexts.

(a) [1920s] (US black) to dance in a provocative manner.

(b) [1980s+] (US campus) of a woman, to make oneself sexually available.

6. [1930s+] (US) to run off.

7. [1990s+] (US prison) to betray, to inform against.

8. [1990s+] (US drugs) to spoil, thus to make no longer suitable or safe.