"TLMYOYO – Tough Luck Mate, You're On Your Own"
A variant of one I learned from a coworker who was former military. I the military lexicon , there were several levels of increasing F***itude:
SNAFU -- (which everyone is familiar with) Situation Normal: All F***ed Up
FUBAR -- (ditto) F***ed Up Beyond All [Repair | Recovery}
FIBYOYO -- (as above) F*** It, Buddy -- You're On Your Own
FIIGMO -- (the level of f***-uppery beyond which there is no other) F*** It; I Got My Orders