Do something as if/like there’s no tomorrow
Definition 1 of 1
Pro Tip 1/3Urgency Implied
It suggests doing something with urgency as if you won't get another chance. 
He spent money as if there's no tomorrow.
Pro Tip 2/3Emotional Intensity
It can express a strong emotion, like joy or desperation, influencing one's actions. 
She laughed as if there's no tomorrow, forgetting her troubles.
Pro Tip 3/3Hyperbolic Expression
This phrase is hyperbole, meaning it's an exaggeration not to be taken literally. 
They danced as if there's no tomorrow, thoroughly enjoying the moment.