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1.
An acronym meaning: Shoot me in the Fuckin' Face.
A variation of FML.

Used mostly in text messaging to convey complete and utter annoyance.
First Person: "I have 7 tests and a paper this week"
Second Person: "Wow, That's rough"
First Person: "I know just SMIFF"

or

There's so many annoying people here today. SMIFF
av jetwake08 11 oktober 2011
 
2.
How some people say smith.
yo what college are you going to?

Johnson C. Smiff
av hyroller 28 februari 2009
 
3.
To out think or out do.
I totally smiffed him during the debate.
av Cathy 9 mars 2004
 
4.
A Terse exclamation of approval. Shortened from Smiffy which is a bastardization of Spiffy.
"Your last minute order will arrive at 9am tomorrow, guaranteed."
"Smiff..."
av Maetrix 7 januari 2008
 
5.
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!"
av GruffHater 15 maj 2009
 
6.
SMART MOUTH IDIOT FLIP FLOP.

It's when a person who is an idiot starts running their smart mouth while looking like a damn fool wearing flip flops.
"Look at that SMIFF over there talking about garbage he don't know about"

"He is the biggest SMIFF I know"
av h3rt@ 24 november 2011
 
7.
(verb) To out think or out do.
When I snuck out past my mom last night, I was totally smiffin'
av BlueDrowsy 9 mars 2004