Word used to express disappointed yet accepted
state of undesired feeling, situation or
physical state. A vocal statement of realization - that things are f-ed up and you can't change it. "That's erf'ed up."
You just woke up from a gigantic night of partying... realize head is pounding and stomach about to hurl. Instead of groaning, which could
mean anything, you mutter "ERF!!" and those laying around the room also waking with hangovers acknowledge your
state and also chime in with an affirmative, "ERF!".