playing traunt, skipping school, missing lessons, can also apply to religious lessons
adam: i didnt see you in maths man?!
z: screw maths, i was bunking man, i went down my mates yard to watch the exorcist!
adam: cool!
(the next day)
teacher: z, why did you bunk maths yesterday?
z: coz i felt like it, what the hell are you gonna do?
teacher: ummm.....
Also spelled bubkes but still means the same thing. The word Bupkis means 'nothing, zero, having no value'. Also it is said by the television character Dr. Zoidberg on the show "Futurama" since he is a Jewish lobster and this word has a Jewish origin it all makes sense.