(1) a homosexual
(2) someone who masturbates to excess
(3) a female who loves to give her man handjobs
"I hear Bob said his new girl is quite a cockboxer."
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(1) A person who wastes time chronically.
(2) A person who chronically Masturbates.
(3) Or, Both.
"What you mean you can't get your work done? You're just a freakin' boneshiner."
"Dude, y'all'r a professional boneshiner."
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