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The phrase used to judge how sexually aroused you were, or how sexually aroused someone would make you.
The phrase plays on 0 - 60mph, with "Semi" being a half erect penis.
*DAMN! I went 0 to semi in 2.4!

*She'd get it 0 to semi in about 1.7!
by DaveG217 May 20, 2006
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Oct 3 Word of the Day
I couldn’t care less (but one must keep up appearances, right?)
Frenemy has a family tragedy. "Thoughts and prayers."
by November 05, 2018
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