Top Definition
When you get a girl to ride your dick in a movie theatre while your mom is down 2 to 5 rows, any more or less is just crazy, it also is easier to have a scitso monkey.
dude my mom caught me attempting the 39th base yesterday..
#17th base #sex #porn #movie #dick #pussy
by Duncsin July 07, 2008
6 Words related to 39th base
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