Galch - A Welsh slang term for cocaine that's like a party in your b

A Welsh slang term for cocaine that's like a party in your brain, and your brain is throwing a really loud party.

'I took a hit of Galch, and now I think I'm a wizard.'

'He had three hits of Galch. Now he's dancing on the table.'

'She said she'd bring Galch, and she brought a bag of salt. That’s not Galch, that’s betrayal.'