Definitions by Divi

20th base 

giving yourself a blowjob and then your penis blows up.

"Dude I went to 20th base last night"
"Can you really?"

20th base by Divi September 17, 2006

18th base 

growing a penis or vagina and having sex with yourself

"woh dude I went to 18th base last night"
"..."

18th base by Divi September 3, 2006