a) Literally: The pubic hairs around the butt. See: buttfluff
b) Figuratively: Style without substance, frivolous, useless, meaningless, unintelligent, pointless, form lacking function, redundant, annoying, irritating.
The Prisoner remake was pure butt fluff. Go watch the original if you have a brain.
That girl is hot but she's got nothing but butt fluff between her ears.
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When computer networking goes bad. When trying to set up a computer network, you encounter several unexplained problems, troubleshoot by pulling out (jerking) a lot of cables around, you learn a lot about the network, but in the end you're unable to solve the problem in the time alotted. It is very frustrating. It's a low-brow humorous euphemism for an analogous male sexual act. Both are exercises in futility which may be fun and consume energy but produce no practical results.
Netjerking is a lot of fun but as usual accomplishes nothing.
My buddy and I spent all afternoon netjerking in the computer lab.
The client had me running around the building netjerking until my arms were tired before giving up for the day.
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