Top Definition
Stands for "Intercourse is inevitable." This refers to a situation where sexual activity is certain to occur. This is usually during a social situation at a club or party where alcohol is being consumed but is not limited to these settings.
"Dude I totally met this chick on the dance floor and it is totally triple i. Intercourse is inevitable. Can I use your bed?"
by mr irvine March 29, 2009

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