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eighteen years old 

The year when your parents no longer whoop your ass.
Person 1: I TURNED EIGHTEEN YEARS OLD!
Person 2: No more ass whooping from your parents!
eighteen years old by iTwilight April 12, 2009

Eighteen Years-Good

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.
Eighteen Years-Good by robes March 10, 2006

Eighteen year bet 

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
Eighteen year bet by Beekmaster21 November 23, 2017