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1.
Oh My Shitting Fuck!

Variation on OMFG, for when some crazy shit surprises you.
Eg 1, OMSF! Did you see the size of that bird, it could of taken our baby

Eg 2, There's only one acronym to describe my feelings right now and that is OMSF!!!
by j# May 15, 2010
 
2.
Oh My Sweet Fez - Exclamation of your love for someone who is weird or acts strange
"OMSF, you're crazy."
by SweetFez July 10, 2008
 
3.
Oh my secular figurehead! An atheistic alternative to OMG.
OMSF! PONIEZ!!!
by st1977 August 30, 2011