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1.
A Socialfail is an activity that ruins ones social life.
"You play World of Warcraft? What a socialfail"
by Egotist. December 20, 2008
 
2.
A social fail is a person with no friends. Can also be applied to someone who always do stupid things in public.
Have you met the new girl downstreet? She doesn't have many friends aronud here.
No, she is a social fail.
by Swordfishy January 10, 2011