Fallback Friend
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."