Hear and comprehend, as in verbal communication. Radio slang used to determine the proper transfer of a message. Proper responses would run along the lines of "Roger." or "I copy."
(Often used with an implicit article, like "head") Editor: "I need you to give copy by midnight. Or you can give head instead."
(Note that it is never "give a copy", or "get ahead".)
Someone says something that you think sounds dirty, you say "copy" then can "paste" it later to the person who said it so they would have to repeat it.
You can also delete if you say something before someone calls copy on you
Henry: Hey, where did Joey go?
Adam: He went to get somesausage, he said he'll be back in about 10 minutes.
Henry: ...COPY!