To modify a data structure in a random and unintentionally destructive way."Bletch! Somebody' s disk-compactor program went berserk and scribbled on the i-node table.""It was working fine until one of the allocation routines scribbled on low core."Synonymous with trashcompare mung, which conveys a bit more intention, and mangle, which is more violent and final.[Jargon File]