Serbsip Share definition Flag The act of drinking half of a beverage that does not belong to you, when asking only for a small sip. "Man," Jordynne said. "Sara serbsipped my Pepsi again today." Serbsip by MerMaster October 15, 2007 0 0 Get merch Get the Serbsip mug. Buy Now — $32.95 See more merch