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1.
Homer Simpson's spelling of smart
I am so smart! I am so smart! S-M-R-T! I mean, S-M-A-R-T!
by Chris Ridsdill February 27, 2004
 
2.
In "Homer Goes to College," Homer gleefully sets his high school diploma aflame, while singing, "I am so smart, I am so smart, S-M-R-T, I mean S-M-A-R-T!" Behind him his living room is going up in flames.

The now legendary "S-M-R-T" line was actually not in the script and was a genuine error by voice actor Dan Castellaneta. However, the error was so much in Homer's character that they chose to include it in the finished product.
People now chant either "S-M-R-T" or "I am so smart, S-M-R-T", particularly when they're feeling stupid, celebratory, or both.
by Kaleah November 03, 2005
 
3.
Derogitory opposing form of "smart", as if to say stupid. Used on chat or IM where expression of the concept would take many characters.

"Oh really eh, well I guess i'll do that then, you're so smrt"
by Little j (of Flylife) August 27, 2002
 
4.
A nice way of saying that someone is so stupid, that they don't even know how to spell smart.
"I'M S.M.R.T.! YAAAAAY!!!"
by LAURENANDCHELSEA April 30, 2006
 
5.
"Smrt" means "death" in most slavic languages.
"dervis i smrt" is a classic of bosnian literature.
(the death and the dervis by mesha selimovich)
by requiemx April 30, 2006
 
6.
An often used acronym for "suck my right tit"; normally said in desperation, fear, anger or disdain of one's neighbor or pet.
Thanks for pissin on my Manolo Blahnik's again. smrt!
by fucwad March 15, 2004