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A Jacko is that friend who always ruins the vibe by bailing before paying for the drinks. They’re like a rat in a bar who runs when the bill comes.
I was the Jacko last night. I said I had to go puke. I just wanted to avoid the bill.
My buddy Dave is the Jacko of our group. He’s always the one who says he has to go to the loo before the bill hits.
I was the Jacko again. I told them I had to go find my lost dog. I just wanted to leave before the tab came.