The sons of the family mechanic talked about "wallering a hole", in the sense of "to wear and enlarge in an uncontrolled manner" ("the bolt was loose and wallered out the hole, now it don't fit"), or (with contempt for shade-tree mechanics) "to intentionally enlarge a hole in an uncontrolled manner" ("that just wallered out those holes instead of using a drill bit of the proper size, now nuthin' fits right").
Has anyone else seen this? I'm curious if it was a family invention or if it's a word of real usage.