To be put in the position of sidechick while dating someone who wants to go back to their ex or find a new chick. But they want to see you on the side.
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.
the process of having one's digital data (e.g. contacts, images, music files) suddenly and irreversibly deleted from a local or remote ("cloud") storage device (e.g. mobile phone, computer, server) without having caused, or contributed to, such action
Girl, I would'vecalled you back last week but I got sidekicked and lost your digits