1. The sentence a man gets, in years of Child Support, when he has sex with a dishonest female that refuses to take responsibility for her actions and get an abortion.
1. I had sex with Brittany Spears and got Eighteen Years.

2. I feel you, I'm doing thirty-six years, myself.
by Buttfuckme April 2, 2021
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The year when your parents no longer whoop your ass.
Person 2: No more ass whooping from your parents!
by iTwilight April 13, 2009
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adj; somthing that is as wonderful as sex that is so good, its worth the eighteen years of child support your ass has to pay for not wearing a condom.
Leaving it in felt really good, but not eighteen years-good.
by robes March 1, 2006
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When a group of males invite a group of females to a pool party and ejaculate into the pool. The guy who doesn't get a single girl pregnant is declared the winner.
Jeff: jimmy is down with the guys playing eighteen year bet.
Bob: quite the risk taker he is
by Beekmaster21 November 24, 2017
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