When a guy is going down on a girl and she pees all over his face. Then, when he pulls away with a disgusted look on his face, she punches him in the nose. The mixture of piss and blood is the strawberry lemonade.
Ricky: "Bobby what did you do last night?"
Bobby: "Um, Gretchen pissed on my face while I was eating her cooter and then when I looked up, she punched me in the nose."
Ricky: "Oh, a strawberry lemonade! It happens."
The horrifying concoction of a teenage girl or middle aged woman’s period blood, and her urine, with the period blood representing the strawberry and the urine representing the lemonade. This mix while very dangerous, is widely regarded as very thirst quenching