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Machine tapping is when old farts hit the slot machine screen like it owes them money. It’s basically finger-assisted prayer for people who’ve lost their minds to the casino.
My grandpa taps the screen so hard, I think the machine might cry.
She tapped the machine until it gave her a free soda. Then she tapped it again just to be sure.
He tapped the screen so much, the guy next to him asked if it was a Morse code message.