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.
Sally: No Kimmy! Josh is dating Laura. Tina is just his sidechick.
by iamwifey January 19, 2007
 Get the sidechickmug.
Get the sidechickmug. by FluffyMan20 May 9, 2016
 Get the Sidechickmug.
Get the Sidechickmug. 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 July 19, 2016
 Get the sidechickmug.
Get the sidechickmug. A position allocated to a girl which is neither a wifey or a girlfriend but a side dish like nandos rice
by anonalie August 27, 2013
 Get the Sidechickmug.
Get the Sidechickmug. 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
by sammicakes1202 July 3, 2019
 Get the sidechickmug.
Get the sidechickmug. by Hi I'm bobbob November 22, 2018
 Get the Sidechickmug.
Get the Sidechickmug. 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.
Rafe: Nah, Duncan fancies Jodi, not her. Siobhan's just his sidechick.
by wolfsbaneT9 August 7, 2013
 Get the Sidechickmug.
Get the Sidechickmug.