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 trash compare mung, which conveys a bit mORe intention, and mangle, which is mORe violent and final. [Jargon File]