Pile off verb phrase
To get down off something
My little brother piled off the tree and ran across the yard to greet me.
The driver opened the van's door, and every kid tried to pile off at once.
The ladder fell over while the kids were piling off the roof.
The verb "pile" must be conjugated according to its tense.
The origin of this phrase is not clear.
A group of bad or sinful people
You'd better stay away from them. They are a nest of vipers.