A guage used to measure revolutions per minute (RPM) on engines. It is usually used in the automobiles.
According to the Tach, the engine is turning 7000 RPM's
by bill September 27, 2004
As a verb, to shoulder someone in the crotch. As a noun, the shouldering of someone in the crotch. Generally executed by midgets and received by NBA players.
OW!! That 6 year old just TACHED me.
He deserved a tach.
by Soytsauce March 24, 2007
Singular of plural adjective for the sexiest male.
Also noun for sexiest man alive.
Tach guy is really tach.
That guy is tach.
by Liam April 21, 2003

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