What is tac in weed?

"TAC" in the context of cannabis doesn't refer to a single, established term like THC or CBD. There's no widely recognized cannabinoid or terpene with that abbreviation. It's possible:

• It's a slang term or abbreviation used locally: Cannabis culture has a lot of slang, and regional variations are common. The meaning of "TAC" could be specific to a certain area or group.
• It's a misspelling or a misunderstanding: The person might have misheard or misspelled another term related to cannabis.
• It refers to a specific product or brand name: Some cannabis products might use "TAC" in their branding, but this wouldn't be a universal term.

Without more context, it's impossible to definitively say what "TAC" means in relation to cannabis. If you encountered this term somewhere, providing more information about the source would help clarify its meaning.