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1.
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.
автор: iamwifey 17 января 2007
 
2.
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"
автор: anonalie 18 июля 2013
 
3.
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.
автор: wolfsbaneT9 7 августа 2013
 
4.
A dusty, thirsty bird that one keeps around strictly for beating up the hot box. You usually have to gas her up by alluding to the possibility of a relationship in the near future, in order to get the buns. A throw away broad that an individual wears out like a boss, unbeknownst to said individual's main squeeze. Side-chicks are usually cool with their status as a slide-off due to the fact that they either have no shame or they're blinded by love. Not someone that you'd want to bone without a rubber. Guys can be side-chicks as well which could be equally, if not even more pathetic.
My wife is headed to work so I'm just going to sleep until two in the afternoon and then call the side-chick over real quick to get my dick wet for a minute.
автор: YessCubanB 23 июня 2014
 
5.
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?"
автор: The Road Kraken 13 ноября 2009
 
6.
Like the word "sidekick" to a superhero, a side chick is a girl that tags along with another more popular girl or guy.
Brittany's side-chick is sooo lame.
автор: Beliver of the Duck 5 апреля 2009
 
7.
Female version of a "wingman". I.e. a female willing to help her friends find successful romantic partners and avoid awkward social interactions.
"Jenny would've ended up with a real loser if it hadn't been for her sidechick".
автор: SideChickie 9 января 2011