Top Definition
rythming slang for wife
the bread knife gave me an evil stare last night after I asked could I search her box. She thought I asked could I do her stick my cock in her ass...she nearly stabbed me

ps thats is what I meant though
by AGnumbnuts November 24, 2011
Taken as a spin off from the term "to cut someone's lunch" which in turn means for one person to 'hit on' or 'flirt' with another person's partner/girlfriend/spouse.

A breadknife is used to cut a sandwich, which may be someone's lunch.
A friend decides to flirt with your grilfriend when you are not present, he could be described as cutting your lunch, and thus you are entitled to call him a "Breadknife"
by Finchy19 October 12, 2009

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