Simple past tense and past participle of laff.(verb)
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Use "laffed" in a sentence
"I did get a COUNSELOR and after talking to me one time he said i had LATENT SOCIOPATHIC TENDENCIES so i looked that up in my DICTIONARY and laffed becuz for a smart guy he was awful DEVELOPMENTALLY DISABLED."
"I actually laffed owt lowd when i read ur commint!"
"Realized today taht he has nawt laffed since he came home frum teh hospital in Octember…"