(n) A friend that you can no longer reach whether they have a drug problem, an alcohol problem, or a relationship problem.
-Hey, Christine! How's life treatin' you? I've got an STD and I'm about to declare bankruptcy and I can't drive downtown anymore because I've got a DUI. See you!

-Woah, dudes, she's a lostfriend.
by Iwillnot January 21, 2010
Get a lostfriend mug for your father Abdul.