Green’s Dictionary of Slang

hearse n.

(US)

1. (also hearse-driver) a pessimistic person.

[US]R. Grant Confessions of Frivolous Girl 114: One girl had nicknamed him ‘the hearse’ on account of his habitual melancholy.
[US]F. Remington letter 15 May in Splete (1988) 209: Well you old hearse driver.
[play on dead house under dead adj.]

2. (US) a large measure of beer, cheaply priced and served in a bar which does not offer free lunch.

[US]Sun (NY) 21 Apr. 7/2: There are some men who prefer hoisting a ‘hearse’ in a ‘dead house’ to paying ten cents fot the same drink and a free lunch in another saloon.

3. a police patrol wagon.

[US]W. Norr Stories of Chinatown 51: I was just getting into the hearse after being sentenced when Ida ran up.

4. a large automobile.

[US]T.A. Dorgan in Zwilling TAD Lex. (1993) 108: If they took longer than 10 minutes to put that hearse together [...] they were loafing on the job.
[US]W.C. Anderson Adam M-1 201: I have a new hearse.

In compounds

hearse-chaser (n.)

(US Und.) one who preys on the relatives of newly deceased people, esp. by claiming there are outstanding bills to be paid.

[US]Sun (N.Y.) 19 Feb. 28/1: ‘Hearse chasers’ are vultures who prey on the estate or relatives of dead men by presenting false claims or selling biographies at exorbitant prices or in dozens of other ways.
[US]D. Dressler Parole Chief 223: Hearse chasers, who bilk thousands of people yearly.
hearse-driver (n.)

see sense 1 above.