1. When you are so addicted, you're jonesing for a sweet, carbonated, caffeinated beverage that bubbles sweetly down your throat and finally getting one is ecstacy.
2. You're in the middle of hot sex and all you can think about is drinking a soda.
That first diet Pepsi in the morning gives me a sodagasm.
I poured soda on his dick and then sucked it off because I was so thirsty and had a sodagasm.