The friend that your other friends don't know, who you go to when the shit hits the fan.
Jack:I'm tired of all the drama,I'm gonna hang with Chris.
Bob:Who?
Jack:Exactly.

"Dude, Where were you last weekend?"
"I was at my fallback friend's place all weekend, so I could avoid the shit thats been happening."
"Good plan."
by The New Man April 21, 2008
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The "friend" you go to when you have no one else to hang out with, whom you would never talk to otherwise.
Michelle: "Well, Kayla just ditched me and I don't want to stand here like an idiot. I guess I'll go talk to Janice, my fallback friend."
by FOSHOYO May 20, 2008
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