I'm going to dispute a charge on a tab at a bar I forgot my card at
Do you think it's safe for you to do that?
I don't know, I'm thinking of calling for help
I hope you get whatever help you need down there to make you feel secure.  That being said, if you actually drank that stuff on your tab you need to pay for it.  To do otherwise would be stealing.
Fuck you, you're dumb. I don't owe anything.
They could dispute the dispute if you did consume something, I just don't want you to be surprised. People are expected to pay for their things even if they were drunk and cannot remember.