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 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 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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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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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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The person you are cheating on your boyfriend( or girlfriend) on
Oh no! My wife found out about my sidechick
by Hi I'm bobbob November 22, 2018
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Girls you have sex with on and off whilst you're looking for the one you want to go out with.
Georgia: Duncan and Siobhan slept together again last night. Do you think they're gonna go out?

Rafe: Nah, Duncan fancies Jodi, not her. Siobhan's just his sidechick.
by wolfsbaneT9 August 7, 2013
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