What it means
Your mutuals are the people you follow and who follow you back online. They're your little internet almost-friends: you see each other on the timeline, reply to posts, trade memes, and kind of know the vibe even if you've never met once in real life.
Usage examples
"We have been mutuals for years but never met in person."
"One of my mutuals just posted the funniest thing."
"She's one of my mutuals from Twitter but we chat like we've known each other for ages."
"My mutuals were hyping me up in the replies all night, bless them."
Where it comes from
It comes straight from mutual, meaning shared or felt on both sides. Online, especially on Twitter and later other platforms, people started using mutuals as a noun for users who follow each other back. By the 2010s it was fully normal internet slang in English-speaking spaces.
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