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A variation of the blowjob in which the woman (or man, not that there's anything wrong with that) giving the blowjob has poprocks in their mouth.
Jeff: "Lily gave me a little surprise when in the middle of the blowjob my dick started popping"

Nick: "Well, Jeff, thats called a fizzjob"
Eating a bag of poprocks then preforming oral sex while the poprocks are "popping".
"Dude, my girlfriend gave me a fizz-job last night"
"Yea, it felt like an erotic science fair project!"
by GuardNo3 October 14, 2008