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1.
An informal, unofficial baseball statistic for closers. Stands for Save, but Made Us Really Fucking Nervous.

This happens when the closing pitcher is put in during a save situation but allows the tying run to get on base before finally earning the save.
"Did Hanrahan get the save last night?"
"Yeah, but it was a SMURFN."
by ksek September 10, 2013
 
2.
Improper spelling for sm00rfn
A: Hey smurfn!
B: n00b its sm00rfn
by Mara Haikara June 28, 2007