Top Definition
A small winged insect that buzzes around bad oil.

Their larvae swim in the oil and feed on other insects and bio matter trapped in it.

Think of flies on shit. Except, in this case, the oil is the shit.
Martha: John, the heater won't go on!

John: Damn, I knew I shouldn't have bought the oil from that cheap ass company. There was an Oilfly buzzing around the truck!
by Crissss December 20, 2012

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