1941, British air force slang, probably related to bombing; possibly echoic. Related: Clobbered; clobbering. In late 19c. British slang the word principally had to do with clothing, e.g. clobber (n.) "clothes," (v.) "to dress smartly;" clobber up "to patch old clothes for reuse."
jargon
To overwrite, usually unintentionally: "I walked off the end of the array and clobbered the stack."
Compare mung, scribble, trash, smash the stack.
[Jargon File]
(1994-12-16)