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When you're too lazy or too tired to say 'haha' properly and just slap a 'z' instead because your brain is dead and you're too high to care.
Bro just said 'Hahz' when I told him my dog ate my homework
She texted me 'Hahz' when I told her my mom called me fat
He replied with 'Hahz' when I said I failed math again