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Give someone a pat on the back means to praise, to congratulate someone.\r
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Usage in a movie (The Simpsons Movie):\r
- Youre not strangling me.\r
- What the.? Stranglings only good for. Well, its not really good for anything. I think the only time you should lay hands on a boy is when you give him a good old pat on the back.\r
- Hey, what the hell are you.?