DCHP-1 Online
doozer [cf. Brit. dial. douse a heavy blow] Slang 
n. something extraordinary in size, interest, or strength; often in the phrase "a doozer of a . . ."; whopper.
- 1949 "Paying for three World Wars now. Next one'll really be a doozer, and expensive."
- 1953 This time he not only grew a "doozer" [of a wheat crop] but is reaping a handsome financial reward as well.
- 1962 The finale was a doozer.
- 1949 "Paying for three World Wars now. Next one'll really be a doozer, and expensive."