A variation of FML.
Used mostly in text messaging to convey complete and utter annoyance.
Second Person: "Wow, That's rough"
First Person: "I know just SMIFF"
There's so many annoying people here today. SMIFF
"Hes a cock-smith" and alternating the ending to avoid clashes with the popular name "Smith".
Can also be lengthend to "Smiffington" which in esence, is a less harsh version of the word. Also better around OAP's or vulnerable people.
Friend 1: "Wheres <friend>?
Friend 2: "I dunno, think he is sitting in tonight.."
Friend 1: "God, he is such a Smiff!"