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drymilk or drymilking is a term used when you've had sex several times and you're empty on fluids, in other words driving on an empty tank.

Drymilking is common amongst newly weds and young couples having sex multiple times per hour before time is given to regenerate new sperm cells.
"I don't think we can do this any longer" - "But I'm still horny" - "Lets drymilk it"
by I2ustySpork February 04, 2010