the other woman; also known as the mistress; a female that is neither a male's wife or girlfriend who has relations with the male while he is in another relationship
Kimmy: Look at Tina and Josh...are they going out?
Sally: No Kimmy! Josh is dating Laura. Tina is just his sidechick.
by iamwifey January 17, 2007
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a side chick is a person with another person while that person is in a realationship
a man have his wife and he as another girl that is not his wife nor his girlfriend so that girl is his sidechick
by brianna graham from cdwn March 19, 2016
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sidechick is known as the mistress; a female that is neither a male's wife or girlfriend who has relations with the male while he is in another relationship
liv is not his girlfriend it’s his sidechick.
by sammicakes1202 July 4, 2019
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A woman who provides a male show host (primarily in radio) with occasional, or sometimes frequent input and conversation on the current topic. Usually a producer or news reader, she is rarely credited formally for contributing to the show but is always on the cusp of chiming in.

A sidechick can be present from the outset of a show, but usually is added in when ratings drop to increase female demographics.
"I like this guy's show but who is that girl that he keeps talking to in the studio?"

"Oh, you mean the sidechick?"
by The Road Kraken November 14, 2009
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A sidechick is someone who is not included a situation but likes to get involved and says unnecessary stuff behind the main person or one who follows around a main person
A main person is shouting or getting rude to you and the sidechick will try to get involve and say inrelevant things jut to be relevant
by sandysunshell October 12, 2017
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A sidechick is a women that you have a separate relationship with
Wife: WHO THE FUCK IS THAT?!

Husband: She's my sidechick
by FluffyMan20 January 27, 2016
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A position allocated to a girl which is neither a wifey or a girlfriend but a side dish like nandos rice
"Hey, look at those sidechicks Amy, cheyan tattendaa"
by anonalie July 18, 2013
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