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1. A name given to a student by a teacher, in relation to his sneakyness and/or laziness.
2. A nickname for somebody named Finnian
3. A computer/phone hacker
1. You is a slacker, Mr. Finnster.
2. Hay Finnis J. Finnster, what's up
3. That guy beigeboxed me last night! What a finnster!
by Mr Cnowledge June 13, 2009
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