GC
GC (abbreviation) means Group chat: a messaging thread shared by three or more people. Example: “Ask in the GC whether anyone's driving.”
How to use GC
Learner’s notesIn plain EnglishUsually short for 'group chat'.
The group-chat sense is texting slang and is almost always written, not spoken; the construction sense is standard trade vocabulary.
Fill the gap
Can you complete this real example?
Ask in the _____ whether anyone's driving.
Etymology
An initialism, standing for group chat, gift card or general contractor depending on context.