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1.) JAT (pronounced "hat"): the act of laughing hard, to the point of producing phlegm. Reminiscent of Ralph Kramden (the Honeymooners). 2.) Jose Carlos Abril laughing uncontrollably; possibly spurting whatever he's drinking out from his nose. 3.) Simple, wholehearted, innocent laughter, having nothing at all to do with either jizz or defecation.
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