HA, this is the third time I have seen u online 2day!
This page explains what the acronym "HA" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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As an acronym, HA stands for "Hello again." It is rarely used because, as you might expect, readers often mistakenly interpret HA as laughter.
If a person you are chatting with begins a conversation with HA, and you can't think of a reason why they might be laughing, they might be saying, "Hello again." You can respond with "Hi," "Hey there," or "Howdy," and then let the person know that their use of HA confused you.
Who knows? Maybe they are actually laughing, and they'll let you in on the joke.