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It's the word you use when you're too lazy to think and your brain is full of garbage. It's like saying 'whatever' but with more attitude and less effort.
'I don't know what that is, it's just galongwallah,' he said, not looking up from his phone.
'She asked me what I was doing, and I said, 'galongwallah,' and walked away.'
'He tried to explain the problem, but I just said, 'galongwallah,' and left the room.'