“I’m not fat—I’m fluffy”

“I’m not fat—I’m fluffy” is a jocular saying that has been printed on many gift items, often with the picture of a fluffy animal. “I’m not fat; I’m…fluffy” was cited in print in 1985.
 
Similar sayings include “I’m not fat—just short for my weight,”  “I’m not overweight—I’m undertall,” “I’m not fat—I’m just big boned,” “I’m not fat—I’m just easy to see,” “I’m not fat—I’m cultivating mass,” “I’m not fat—I’m flooded,” “I’m not fat—I’m insulated,” “I’m not fat—I’m just so sexy, it overflows” and “I’m not fat—my stomach is just in 3D.”
   
   
Google Books
A Whole Lot of Woman
By Anna Hudson
New York, NY: Dell
1985
Pg. 13:
“I’m not fat; I’m . . . fluffy.”
 
12 January 1986, Augusta (GA) Chronicle, pg. 8A, col. 4:
I’M NOT FAT
I’m Just Fluffy!
(An ad for Diet Center shows an owl.—ed.)
 
Google Books
July 1987, Working Woman, “Portly Pups and Fat Cats” by Patricia Curtis, pg.100, col. 1:
The caption of a Sandra Boynton cartoon showing a very fluffy (and very fat) little animal reads “I’m not fat, I’m just fluffy!”
 
Google Books
Miss You Like Crazy
By Eliza Clark
Toronto, ON: Coach House Press
1991
Pg. 30:
“I’m not fat, I’m just fluffy.”
 
Google Books
A Test of Faith
By Karen Ball
Colorado Springs, CO: Multnomah Books
2004
Pg. 330:
Winnie held up the T-shirt with a lamb on the front and the saying, “I’m not fat, I’m fluffy!”
 
The Internet Movie Database
Gabriel Iglesias: I’m Not Fat… I’m Fluffy (2009)
TV Movie -  60 min   -  Comedy -  8 November 2009 (USA) 
Director: Manny Rodriguez
Writer: Gabriel Iglesias
Stars: Gabriel Iglesias
 
Google Books
Piper Reed Gets a Job
By Kimberly Willis Holt
New York, NY: Henry Holt and Co.
2010
Pg. 63:
A magnet on her desk had a picture of a sheep and read, “I’m not fat, just fluffy.”