Top Definition
This is a sound that is usually made a a car nerd when they feel the need to imitate the sound made by the spooling of a turbine in a 4 stroke combustion engine. It is then followed by the "koosh" made by the opening of the BOV ( blow off valve, or pop off valve )
As you briskly walk by someone you like to annoy, *pssst koosh*, and then turn to see the awkwar look they give you. Or just get punched in the stomach.
by the drifter April 08, 2004
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