When you have less than zero fucks to give. You literally have depleted all your rollover fucks and used up a certain amount of future fucks as well. The amount you care about something is approaching negative infinity.
A customer walks into a retail establishment with a bitchy complaint. Miko says to her dumb hoe employee, "Kelly you take care of her I give negative fucks, my fucks are used up all the way to next week."
by babyuf123 April 28, 2014