One whose primary vocation is dealing with numeric data. Examples of professions that might be referred to as number crunchers are accountant, data processor, statistician, mathemetician, etc.
I'm so glad I'm not a number cruncher like those poor bastards in the statistics division.
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi