"Fizzlepop" is a sexual fetish, or rather a watersports practice.
It consists of injecting
lemonade,
7-up craneberry or grape juice into someone's genitals through their urethra, by filling someone or your own empty bladder with a drink using a large capacity syringe, and a
short latex tube and put it in the urethra ( for women) and/or with a sterile Foley catheter (a silicone tube for men that goes in the bladder).
Then you can serve your partner a warm
Fizzle Pop by pissing on their glass, or their mouth directly.
I recommend to drink a lot right after the practice to prevent any bladder infection, and right afterwards, use the catheter again to fill the bladder with saline solution to prevent any
bad reaction from the remains of
whatever the soda may contains, and flush it by peeing it out again. ( however I do not really recommend injecting directly any drinks in the vagina, as it may cause
trouble, or in the penis directly with a syringe as it could fill the
male's seminal vesicle.)
Many watersports-related pornographic films actually use
fizzle pops instead of releasing actual urine on the actors and keeping a visually appearance of actual urine, depending of the flavor and desired appearance, allowing to film many sequences with different angles by refilling the actor or actress's bladder with drink.