To indicate a sad time, or some kind of disappointment.
"Hey man, you going out to the bars with us tonight?"

"Nah, girlfriend is dragging me to a chick flick. It's so flat soda."

or

"Working late again?"

"Yeah, it's like flat soda."
by jsmith0708 April 07, 2008

5 Words Related to Flat Soda

A girl with an attractive body, but an ugly face. She is usually used and abused for sexual pleasure by men, but never wifed. You just beat her pussy up and bounce.
Dude 1: Yo! Did you hit up that girl from last night?

Dude 2: Nah. Shes like flat soda. Ima just keep her around in case I get thirsty!
by The Bizzle 1978 March 16, 2014

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