thirteenth base

having sex with your partner's corpse after they reach twelfth base

I fucked this chick to death, and then I went to thirteenth base with her.

thirteenth base by 69Dildozer69 August 10, 2009

Thirteenth Grade 

Community college; where the underachievers go after high school.

"What you going to go when you graduate?" "I'm going to Union County College." "Oh. Thirteenth grade."

Thirteenth Grade by Dr. Shatner June 6, 2004

thirteenth step 

the thirteenth step is used to describe the efforts of an old timer who tries to screw a newcomer or someone with less than a year of sobriety.

jim had 10 years of sobriety and attended AA regularly. when he laid eyes on sophia, the newcomer, he decided to thirteenth step her.

thirteenth step by rich v. March 27, 2007

thirteenth base

taking a persons urine in your mouth, then shooting it up their anal or vaginal hole.

Thirteenth base is hot

thirteenth base by sniff&sneeze June 14, 2010

thirteenth button 

Old military training film euphemism for a condom.

Don't forget to button your thirteenth button when on shore leave.

thirteenth button by G D Hetz November 12, 2007

THIRTEENTH-FLOORED 

To isolate yourself somewhere above everyone and hate on everyone below you.

Over the events of the day and completely thirteenth-floored

THIRTEENTH-FLOORED by Shredhead5280 October 5, 2019

Thirteenth Reason 

Don’t jump. *sets up camera* Okay, you can jump now.

“I think I just found my thirteenth reason,”

Thirteenth Reason by Veeve June 14, 2023