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2.
To bend your leg, making an improvised vagina with the inside of your knee, then you or a partner insert one or more fingers and commence finger-knee intercourse.
I was bored in class today, so I extrapolated myself.

My girlfriend extrapolated me all night long, because we don't believe in sex before marriage.
by spencer93 April 24, 2010
 
1.
To explain.
P: "This girl is a whore."
D: "Could you extrapolate on that?"
by Cleaningisawasteoflife December 23, 2009
 
3.
To release your manly(or womanly) fluids to gain pleasure.
Finally, near the end I extrapolated all over the baby jesus because I pulled out and realized we were still in church.
by Rage February 23, 2005
 
4.
to extrapolate is a method of sex which is so crazy that some consider it the hardest sex position to master, but once mastered it is the most enjoyable.
boy1: "me and girl totally extrapolated sooo hard this weekend... saturday and sunday!"
boy2: "i feel like dropping an f-bomb"
boy1: "i think i did."
by atrax August 03, 2005