Sour Milkshake Share definition Flag A Sour Milkshake is when you jerk off onto a sad girl. My girlfriend was depressed last night so I gave her a sour milkshake. Sour Milkshake by anonymous April 7, 2021 0 0 Get merch Get the Sour Milkshake mug. Buy Now — $32.95 See more merch