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What does HAHA stand for?

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Rank Abbr.Meaning
HAHAHaving A Heart Attack
HAHAHuman Anti-Human Antibody
HAHAHuntsville Amateur Hockey Association (Huntsville, AL)
HAHAHouston Area Hound Association (Texas)
HAHAHealth and Humor Associates (Stamford, CT)
HAHAHuman-Anti-Humanized Antibodies (immunogenicity testing assay)

Note: We have 9 other definitions for HAHA in our Acronym Attic