the sound made when someone gags while giving a blowjob. (the 'C' is silent)
getting a blowjob, listening to her slurp and smack her lips, all of a sudden "chu...chub...chub...CHUBBUCK!" (the 'C' is silent) she gags a little! no prob. slow your roll playa and begin again.
the word chubbuck comes from the ancient greek, meaning 'to choke with dick'. lost for centuries, the word has a new found audience with todays hip youth.
example: "She really chubbucked last night. (on my dick)", or , "I sure hope your huge cock doesn't make me chubbuck. (because of the enormous size)(it's huge)"