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Used in an app called 'Vent' for smartphones, it means "Here for You" where the for is '4.'
Person 1 - "oh no i feel so alone"
Person 2 - "H4U"

(I do not reccomend using this in real life speech)
by MaxKFuller December 10, 2015
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2
It is another way to say "here for you/I am here for you"
Person 1: I feel miserable

Person 2: u knw im H4U <3
by bjoy October 21, 2015
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