Top Definition
a) The feeling you get when you press the "NOS" (N2O GAS AKA nitrous oxide) button in your vehicle

b) Pure Euphoria via Nitrous Oxide released into your "car's" engine
"Hey Topher! Last night, for the first time, i felt NOSfusion when i took my ride on a midnight test drive!"
by Topher G. March 28, 2007
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