| Acronym | Definition |
|---|
| HAHA➣Having A Heart Attack |
| HAHA➣Human Anti-Human Antibody |
| HAHA➣Huntsville Amateur Hockey Association (Huntsville, AL) |
| HAHA➣Houston Area Hound Association (Texas) |
| HAHA➣Health and Humor Associates (Stamford, CT) |
| HAHA➣Human-Anti-Humanized Antibodies (immunogenicity testing assay) |