A mixture (and portmanteau) of the three drinks: Coca-Cola, Fanta and Sprite. Most commonly consumed in restaurants where the customer gets their own drinks refills.
The amounts of each component added are altered to taste.
Nando's diner #1: Alright, I'm off to refill my water glass with Sprite. Anybody else want drinks refilled?
Nando's diner #2: Here, I'll have a sprantickle.
Nando's diner #1: What the fuck?
Nando's diner #2: Sprantickle.
Nando's diner #1: Oh, sprantickle! I thought you said something else there.