Any isomeric paraffin hydrocarbon with the formula C8H18, found in petroleum, used as a fuel and solvent.
With highway gas you usually have the choices of 87, 89 and 92 or thereabouts at the pump. High octane fuels will have a higher number such as cam2 which is 110.
When you pull up to the pump and the numbers on the pump are 87, 89 and 92 octane, it's how many hydrocarbons are in the fuel.
by Grapefruit October 27, 2004
Though there is a scientific definition for this word, it can be used in everyday talk. It describes anything that may be considered as high-powered, unstoppable, or near impossible to defend. Usually used when referring to sports but can be used with other topics as well.
I watched the Cubs game last night and it is ridiculous how octane thier offense is!
Did you see that bartender last night? Her body is octane!
by Ritchey February 21, 2006
A Transformer from the Generation 1 era of the franchise. He is a Decepticon triple changer, usually referred to as Tankor in the later years of the Transformers franchise.

He is the Decepticon fueler, transforming into a tanker truck and a jumbo jet. In the Transformers comics, and as described in his toy bio, Octane is a rather mean and dishonest character, very hesitantly offering up any fuel he's stolen from gas stations or other tankers to his starving Decepticon peers and sending anyone he wishes crashing and burning in any direction.
In the Transformers cartoon, however, he is portrayed as a more likable, funny, and even friendly character. Fangirls know him for his enjoyable personality and his good looks. He undoubtedly remains a selfish character at times, though.
Human 1: Did you just see that plane turn into a robot?
Human 2: Yes! It's Octane! We better get out of here NOW!
by AstroWingTane November 05, 2014

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