KFC (Kentucky Fried Chicken) has the slogan “finger lickin’ good.” ““We were so poor we used to get CARE packages from India. On Sundays, my dad used to load us up in the car and drive to Colonel Sanders’ just so we could lick other people’s fingers,” said by Ace Hanson, was printed in the St. Cloud (MN) Times on March 19, 1984. “So-o-o poor, ‘they had to go down to Kentucky Fried Chicken and lick other people’s fingers’” was printed in The State Journal-Register (Springfield, IL) on August 12, 1986.
 
The KFC joke has remained popular.
 
   
Wikipedia: KFC
KFC, also known as Kentucky Fried Chicken, is an American fast food restaurant chain that specializes in fried chicken. Headquartered in Louisville, Kentucky, it is the world’s second-largest restaurant chain (as measured by sales) after McDonald’s, with almost 20,000 locations globally in 123 countries and territories as of December 2015.
(...)
KFC is known for its slogans “Finger Lickin’ Good”, “Nobody does chicken like KFC” and “So good”.
         
19 March 1984, St. Cloud (MN) Times, “Singer’s fondness for jokes provides punch lines aplenty” by Jeff Wood, pg. 1C, col. 3:
“We were so poor we used to get CARE packages from India. On Sundays, my dad used to load us up in the car and drive to Colonel Sanders’ just so we could lick other people’s fingers.”
(Spoken by Ace Hanson.—ed.)
 
12 August 1986, The State Journal-Register (Springfield, IL), “Fascinates students absord stories at SSU” by Zion Johnson, pg. 9, col. 2:
(Elizabeth—ed>) Ellis, 42, entertained the children Friday with a story of a family that was so-o-o poor, “they had to go down to Kentucky Fried Chicken and lick other people’s fingers.”
   
28 February 1993, Los Angeles (CA) Times, “Hangin’ With Doug E: Viewing life in Harlem on a new kind of ABC sitcom” by Daniel Carone, pg. 8:
“My family was so poor, my family was so poor, my family was so poor they’d go to Kentucky Fried Chicken and lick other people’s fingers.”
(Doug E. Doug.—ed.)
   
Google Books
A Prairie Home Companion
Pretty Good Joke Book
Edited by Brian Becker
Minneapolis, MN: HighBridge
2003
Pg. 80:
Yo’ mama is so poor, when she goes to Kentucky Fried Chicken, she has to lick other people’s fingers!!
   
Twitter
Yo Momma
@yomomma
Yo Momma so poor, when she go to KFC, she has to lick other people’s fingers!
3:20 PM - 10 Mar 2008
 
Reddit—Funny
Cartman’s Yo mama’s so poor jokes from South Park: The Poor Kid (S15E14) (self.funny)
submitted November 21, 2011 by The_Limping_Coyote
. Your mom is so poor she can’t even pay attention
. His mom is so poor the ducks throw bread at her
. Cartman’s mom is poor that when she goes to KFC, she has to lick other people’s fingers
 
Twitter
🤣 The Dad Joke Man 😉
@DadJokeMan
I’m not saying we were poor when I was young but when we went to KFC we had to lick other people’s fingers…. 😜
3:52 PM - 7 Sep 2018