Present participle of hack; the act of breaking into computer systems, coughing roughly, or cutting something repeatedly.
From hack (an English verb with multiple meanings: to break into systems, to cough, to strike repeatedly, from Germanic roots). The -in ending reflects informal spoken English or dialect where 'g' sounds are dropped from '-ing' endings.
When people say 'hackin' instead of 'hacking,' they're actually following a pattern that's been in English for centuries—dropping final 'g' sounds is found in Shakespeare's plays and shows up across many dialects!
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