A derogatory term given to a friend who fails to show up at a meeting, embark on a drinking night out or generally makes a mockery of himself within earshot. Coming from the line in the "Wedding Crashes";
"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> is such a Smiff".
Friend 1: "Wheres <friend>?
Friend 2: "I dunno, think he is sitting in tonight.."
Friend 1: "God, he is such a Smiff!"