not the right one

literally, someone's left nut

Is a term to tell people to fuck off because who wants only one nut especially the left one

something that you say when you want to be provocative (especially if you are a chick) or use as a sarcastic comeback or reply. This expression is similar to kiss my ass and suck my balls

Said when another being or said situation were to frustrate you & is said to display power or distraught. Insisting you'd rather have your left genital tickled then do what's been asked or required. Or used when someone states something you completely disagree with.

an insult used to spite someone, derived from the fact that the right but is clearly superior

A way to tell someone that they can go fuck themselves.