Dead teachers! Is "hate on" the similiar to verb "to hate'' I hate him and I hate on him. What's the difference? Thanks

It's a slang expresssion used by some young people.

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So, is that the same as "to hate"
It is slightly different than "to hate" and is much more informal. For example, if one says "Do not hate on Barack Obama", they are saying to stop criticizng Obama. If one says "Do not hate Barack Obama", they mean do not feel emotion of hatred toward the current President. "Hate on" is more vocal whereas "hate" is emotional.
It's just non-standard and poor-quality English. "Hate" on makes people who use it, sound uneducated. It's jarring and should be avoided in speaking and writing.

It seems to be limited to non-standard kinds of American English.
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