Off your barnett is when you have consumed a large amount of alcohol and/or drugs and are going on a west one.
Example 1: Henry: "Hey dude, did you see Chris? He has a line of coke and half an E" Jimmy: "Haha, yeah he's off his barnett" Example 2: Tom: "I'm gonna down this whole bottle of vodka" Jay: "LAD YOU'RE GONNA BE OFF YOUR BARNETT!"
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