Top Definition
Can be used to describe many sexual acts that involve exchanging fluids without having intercourse. (comes from the computer term where keys are exchanged in encryption)like the cleveland steamer.
"man i just got back from shannons.....talk about a good diffie hellman....the whole place was wet."

"she wouldnt fall for my famous line so i had to give her the diffie hellman and make sure she swallowed."
by Scooter May 07, 2004

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