Wiktionary
hackerish
a. 1 (context informal English) Resembling or characteristic of a hacker (technically skilled computer enthusiast). 2 (context computing informal English) Resembling or characteristic of a hacker (malicious user who breaks into computer systems).
Usage examples of "hackerish".
The most hackerish of all the hackers, the Ur-hacker as it were, was and is Richard Stallman, who became so annoyed with the evil practice of selling software that, in 1984 (the same year that the Macintosh went on sale) he went off and founded something called the Free Software Foundation, which commenced work on something called GNU.