as if there was/were no tomorrow

Very rapidly and eagerly; without restraint or thought (i.e., as if there won't be another opportunity, so one must do something as much or as quickly as possible). He must have been starving, because Jonathan started wolfing down his food as if there was no tomorrow! Every time Kevin goes out shopping, he starts spending money as if there were no tomorrow. Any time a snowstorm's predicted, the people around here starting buying up bread, milk, and eggs as if there were no tomorrow.

as if there was (or as though there were) no tomorrow

with no regard for the future consequences.

1980 Guardian Weekly Oil supplies that Americans at home continue to consume as though there were no tomorrow.