back nine 

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.

back nine by Wes Wylerson May 2, 2006

Back Nine 

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.

Back Nine by sanfred January 20, 2011

Back nine 

Lost my place in line for following the rules and being polite. back nine

“I just lost my place in line for being polite “ back nine

Back nine by Stupidwords4people June 4, 2018

Back Nine 

The act of having anal sex while on a golf course.

Hey baby, lets go to the golf course and do the Back Nine.

Back Nine by Golf-Pro641128 February 17, 2010

Back nine 

Being polite in a crowd

Fucked up the ass back nine

Back nine by Stupidwords4people June 4, 2018

Back nine 

Getting raped up the ass, non literally, maybe literally.

*Killionaire* Wow, you motherfuckers got raped up the back nine!

Back nine by T-painizzle May 11, 2009

Back Nine 

Putting 9 golf balls in the anus

Went out the other day and played the Back Nine because I didn't have time for the full course

Back Nine by Bundoo September 11, 2016