The name for the erroneous readout on a cell phone's signal strength meter. Mobile phone devices typically display their signal strength on a digital bar graph on the display. This readout often lies, or fibs, about how much signal you don't actually have. Thus a fibbar is a lying phone bar.
Dude 1:
"Dude, you got signal out here?"
Dude 2:
"Yeah I've got one bar...wait, it's a fibbar. Damn."
by Beakster445 July 20, 2013
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