Top Definition
it is where a person inserts their index finger in either the vagina or anus; depending on the way they are laying. their little finger is then inserted into the opposite hole which has not been filled. the motion of a seesaw is then made, thus the name the japanese seesaw.
its in multiple porno movies by the production 'the complete works of hench', and creates an overpowering orgasm that makes the reciever want more, but an acking arm for the one giving.
the japanese seesaw made me cum over and over and over and over, i dont know how i lived without it.
by mafumif January 23, 2008

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