Short for 'judgement hammer'. A figurative object that is referenced to indicate a person who is being judgemental or prejudice.

Commonly used for calling someone out or describing a person that makes snap judgements.
Jordan: I didn't get a good vibe from her last night.

Steve: Don't go throwing the j hammer, you barely even talked with each other!
by RRCsteve February 8, 2011
Get the j hammer mug.