as if there were no tomorrow

• as if there is no tomorrow, as if there's no tomorrow; as if there was no tomorrow (proscribed)
• like there is no tomorrow, like there's no tomorrow; like there was no tomorrow (proscribed), like there were no tomorrow

• Audio (General Australian):

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as if there were no tomorrow

1. (idiomatic) To an excessive degree, oftentimes with little to no regard to future consequences; desperately; recklessly or wantonly; frantically; very quickly or very much.
   • 1999, Carol Brightman, Sweet Chaos: The Grateful Dead's American Adventure, →ISBN, page 106:

     Starting with the Pranksters, who were the first to take LSD out of the war labs and hospitals, hippies were mixing drugs as if there were no tomorrow.

• like it's going out of style
• like one's life depended on it