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1.
The sexual act of eating Fruit Loops, Fruity Pebbles, Trix, and Boo Berry- or any other 'bright, colorful' breakfast cereals- and then vomitting the tacky, dazzling mixture onto your partners chest. The result should look similar to the incredible sweaters that Bill Cosby wore during his highly successful 1980's sitcom "The Cosby Show".
Nicole was overjoyed to receive "a Cosby Sweater" for her birthday.
by Nicole & Eric September 11, 2006
 
2.
A: A oversized, hideous looking sweater with ugly patterns and colors, often worn by old men or hipsters with no taste.

B: A sweater a senile colorblind person would pick out.
As referenced in HIGH FIDELITY: "That's a COSBYYYY SWEATAAH, a COSBBY SWEATAAH!" - Jack Black

"Aww look at that sad sweater, did your mom pick that out for you?"
by definitionmassah January 28, 2004
 
3.
A sweater worn By BILL COSBY on the TV show THE COSBY SHOW. The sweaters were designed by KOOS VAN DEN AKKER, a NYC designer who is famous for his wild collaged garments. After Cosby notables such as Erik Estrada, Chuck Norris, and Richard Simmons became obsessed with obtaining their very own Koos original sweaters. Koos recently started a new line of these sweaters. Not for the faint hearted sissies but for guys with guts! www.koosvandenakker.com
by richardkoek July 17, 2012
 
4.
Someone who gives Bill Cosby a hard time
While Bill was lecturing at the Jell-o pudding pops symposium in Munich, he kept getting heckled by a particularly aggressive Cosby sweater in the audience
by SirHarrington25 May 16, 2014
 
5.
A loud obnoxiously colored article of clothing worn by a man who will preach to you about family values while he fathers children with women who aren't his wife.
I saw this guy wearing a cosby sweater back in 84, he was stealing the hubcaps off of a school bus.
by Bill Dev September 13, 2006
 
6.
The multi-colored lint left in one's ass crack after wearing flannel boxer shorts.
It took me an hour to get that cosby sweater off my ass!
by Jeff Conway September 13, 2008
 
7.
The sexual act of vomiting fruity pebbles onto your lover's genitalia and then pleasuring him/her. The result should look like one of Bill Cosby's wardrobe nightmares from his hit '80s TV show.
I gave my ex-boyfriend a cosby sweater because I'm a sexual deviant.
by anonymousmanofmanynicefaces September 24, 2006