The word 'Digger' is completely interchangeable with the word 'Fuck'. In times of over the top levels of failure, Digger Fucking Phelps may be used, abbreviated as DFP for texting.
This is the exact opposite of Jay Bilas
Dad, I'm really sorry I got chocolate on your Peyton Manning jersey. It's OK though, cause it doesn't fit anymore...right?
Dude, remember that time we had all the guys from the team over for that party and your mom was home? Yeah, we all banged her.
<shouted> Digger Fucking Phelps!