C8 is a slang word for the LGBT+ community. C8 is the downwardmost cervical nerve, symbolizing the hanging hand that gay people often use. It is a very cool way to identify someone as LGBT+.
C8 people are very cool, don't be a bore, be C8.
That guy is definitely C8, did you see the way he behaves arround you?
Do you think Emma is C8? I've had the biggest crush on her since ever.