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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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Jul 1 Word of the Day
sending two texts in a row without a reply inbetween.
Rachel: whats up?
Tessa: not to much! hbu?
Tessa: dude, i'm so bored.
Rachel: stop double texting me.
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2
The backside of a female.
Bro, did you see the that girl that just went by.

Hell yes, that lady had a fine back nine.
by sanfred January 18, 2011
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3
Lost my place in line for following the rules and being polite. back nine
β€œI just lost my place in line for being polite β€œ back nine
by Stupidwords4people June 04, 2018
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