Definitions by sniff&sneeze

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

twelth base 

the action of sniffing & sneezing, when you put your nose up someones back passage and sniff in the delightful aroma, then sneeve, unbleliavable pleasure.

"dude, i totally went to twelth base last night"
"dude, really, what even is that?"
"dude, she totally snotted up my ass"
"sweeeeeeeet"

twelth base by sniff&sneeze February 11, 2010