Shrek is an animated movie about an ogre who goes on adventure to save a princess from a dragon to get his swamp back

References to Shrek on The Simpsons

Shrek appears on a shirt in See Homer Run.

Homer discusses the plot of Shrek the Third to prisoners in Midnight Towboy.

Shrek appears on a Squishee cup in The Good, The Sad, and the Drugly.

Homer draws Selma as Shrek in The Real Housweives of Fat Tony.

A Shrek mask is seen in Politically Inept with Homer Simpson:

Homer steps on a Shrek doll in and says "Donkey!" in The Winter of his Content