To abort a job on a time-sharing system. Used
esp. when the person doing the deed is an operator, as in
"canned from the console". Frequently used in an imperative
sense, as in "Can that print job, the LPT just popped a
sprocket!" Synonymous with gun. It is said that the ASCII
character with mnemonic CAN (0011000) was used as a kill-job
character on some early OSes. Alternatively, this term may derive
from mainstream slang `canned' for being laid off or fired.