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Reference to the anus in regards to the performance of Anal Sex.
1. I played the back nine with my girlfriend last night.
2. I teed off on the back nine but she kicked me off the course.

by Wes Wylerson April 20, 2006
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Lost my place in line for following the rules and being polite. back nine
โ€œI just lost my place in line for being polite โ€œ back nine
by Stupidwords4people June 04, 2018
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When you get little sleep at a friend's house/wherever you passed out, head home, and get the rest of the sleep you need to get a full night's rest; a non-contingent nine hours of sleep.
John: Wow, three hours of sleep at this party? I had better head home to get the back-nine.
by kingPontus January 24, 2010
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