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An act of delightful debauchery where a man is engaged in sexual activity and the woman he is with, standing slightly to the right and facing away from him, uses her left hand to service him until ejaculation. A left-handed milk stout is often performed to celebrate a recent achievement such as a job promotion, a milestone birthday, or hitting a walk-off home run in softball.
Becky: "So Dylan hit the game winning home run in his softball game tonight."
Christina: "Oh wow, you gonna give him a left-handed milk stout?"
Becky: "Yup."
Christina: "You go girl!"
by Ronwrk April 02, 2017
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