"A boss is like a diaper -- always on your ass and…

“A boss is like a diaper—always on your ass and full of shit” is a jocular one-line saying shared by many workers. “Bosses are like diapers — full of shit and all over your ass” has been cited in print since at least 1990, when it was printed on a bumper sticker.

Google Books
The Almanac of Quotable Quotes from 1990
By Ronald D. Pasquariello
Englewood Cliffs, NJ: Prentice Hall
1991
Pg. 241:
Bosses are like diapers — full of shit and all over your ass.
Bumper sticker

24 April 1995, South Florida Sun-Sentinel (Fort Lauderdale, FL), “First Obsession over a bad boss” by Lona O’Connor, Weekly Business, pg. 17:
“My boss is like a diaper, full of you know what.”

Google Books
Juvenile Crime and Delinquency:
A Turn of the Century Reader
Edited by Ruth Marie Mann
Toronto, ON: Canadian Scholars’ Press
2000
Pg. 250:
The family’s style, and their stance towards those whom they consider adversaries, is perhaps best summed up by the bumper sticker displayed on the family camper: A boss is like a diaper: full of shit and always on your ass.

Google Books
Bluebird Rising:
A Mystery
By John Decure
New York, NY: St. Martin’s Press
2003
Pg. 15:
“Who was it that said bosses are like diapers?”
“Full of shit and always on your ass? I don’t know. A very wise person.”

5 April 2006, Atlanta (GA) Journal-Constitution, “The Vent,” pg. B2:
A friend may be like a bra, and a great friend like jockey shorts, but my boss is like a diaper—always on my butt and mostly full of it.

Google Books
Misconception
By Ryan Boudinot
New York, NY: Grove/Atlantic Inc.
2009
Pg. 77:
The tailgate bore an ideology in the form of a bumper sticker: Bosses are like diapers. Full of shit and always on your ass!!!