I guess you have the mother load of printer ink somewhere in your preps?
I swear on a stack of Bibles, in its early days (late 90’s) I actually was asked by my boss to print out the Internet so he could take it home. He’s a wonderful guy and God bless him, but this one left me with my mouth hanging open. :-)
It’s “mother lode” actually. The term refers to the main vein of silver or gold in a mine, if I’m not mistaken. Not trying to be a dick or anything, but for some reason I’ve always been interested in phrase origins.