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1.
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.
by 69Dildozer69 August 10, 2009
 
2.
taking a persons urine in your mouth, then shooting it up their anal or vaginal hole.
Thirteenth base is hot
by sniff&sneeze June 05, 2010