Idioms and Phrases with stuff it
Take back something, as in As for that memo of yours, you can just stuff it. This idiom is used, often as an interjection, to express contempt or defiance. Presumably it is short for “Stuff it up your ass.” [Vulgar slang; 1950s]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.