Side piece

noun, slang

Definitions

Noun
  1. 1
    A person with whom someone already in a relationship carries on a physical affair (not emotional affair) without having the intention of forming a serious relationship. Not gender specific. slang

    "Near-synonyms: (feminine) mistress, side chick, side bitch (vulgar)"

Etymology

Jocular reexpression of the concept of a piece of ass on the side.

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