A person who is careless, unskilled, or mediocre in their work; sometimes a hack driver or someone who makes a living by hacking.
From 'hack' (a careless cut or inferior work) + '-ster' (a person associated with something). This disparaging term combined the cutting action with a derogatory suffix.
The '-ster' suffix in English can be playful or insulting—compare 'prankster' (fun) with 'hackster' (bad)—it all depends on whether the root word is positive or negative.
Complete word intelligence in one call. Free tier — 50 lookups/day.