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A disease where people can't stop tapping on everything like it's their last chance to save their soul. Drummers get it bad. They'll tap on your face if you don't let them.
My neighbor taps on my TV while I'm watching the news. I just let him.
I tapped on my boss's head during a meeting. He didn't notice.
My sister taps on my phone while I'm texting. It's annoying.