Green’s Dictionary of Slang

intoxicated, usu. with drugs, sometimes drink.

1997–2001		Online Sl. Dict. 🌐 roasted adj 1. inebriated.
2002		T. Dorsey Triggerfish Twist (2002) 87: ‘How do you feel?’ asked Bernie. Coleman looked slowly around the room. ‘[...] stewed, baked, fried, cooked, toasted, roasted, [...]’.