The slang term "OC" has two primary meanings online, though Original Character is overwhelmingly the most searched-for and commonly used.
1. Original Character
Definition: Refers to a fictional character created by a fan or artist, not from established official media (like movies, books, TV shows, comics, games).
Usage Context: Predominantly used in fanfiction writing, fan art communities, role-playing games (RPGs), and online art platforms. It signifies creative ownership.

How it's Used:
- Noun (The Character): "This is my OC, Luna. She's a water mage." "I love seeing everyone's unique OCs."
- Adjective (Describing the Character): "Here's some OC art I drew." "He mostly writes OC-centric stories."
- Verb (Creating OCs): "I spend hours OCing." "She loves to OC for that fandom."
Implications: Using "OC" distinguishes fan-created content from canon characters. Ownership is crucial; misusing someone's OC without permission is frowned upon.
2. Own/Original Content / Original Creation
Definition: Less common than "Original Character," it signifies content or an item created by the person posting/sharing it, not reposted from someone else.
Usage Context: Found in online art sharing, design communities, or platforms like Etsy/Creator spaces, emphasizing originality and ownership.
How it's Used:

- Noun (The Content): "This design is my OC." (Less common than "Original Character" usage).
- Adjective (Describing the Content): "Sharing some OC artwork today!" "All crafts shown are OC."
Implications: Used to claim authorship and originality, often to prevent content theft or to clarify that reposting requires credit/permission.
Key Takeaway
When encountering "OC" online, the context is vital. If the discussion revolves around art, storytelling, role-play, or fandom, it almost certainly means Original Character. In spaces heavily focused on original art or craft creation, it might mean Own/Original Content. However, the "Original Character" definition is the primary one sought by most users.