Used in certain pockets of the stand-up comedy subculture. Can refer to a comic or joke that is particularly good or clever. The highest praise one can provide to or about a comic. Example: Bill Hicks was the all-time hammer. Nobody is even close to that guy. OR That joke of yours about Herman Melville and Melrose Place is a hammer.
HAMMER
Meaning of HAMMER in English
Slang English vocab. Английский сленговый словарь. 2012