To (seemingly) disappear from the face of the earth
Disappear to a place one would be very unlikely to be found.
What happened to Tom? I haven't talked to him since ten years ago.
Last time I heard, he got caught up in a drug-related arrest. Somehow escaped from prison and was forced to fall off the grid, probably somewhere in the Amazon Rainforest living with them Natives by now.
Leaving with no warning or reason and not even having the common courtesy to tell anyone.
Don't tell me Frosty's pulling a frosty on us.