1 definition by Finchy19

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 13, 2009
Get the Breadknife mug.