Green’s Dictionary of Slang

drag one’s ass v.

also drag it, drag one’s butt, ...tail
[SE drag + ass n. (2)/butt n.1 (1a)]
(US)

1. [1920s+] to leave, to go, to move.

2. [1930s+] to be fatigued, run down, miserable.

3. [1940s] to be slow, lazy.