ironing
Deliberate substitution for irony. Stems from a quote by Bart Simpson in the episode "Grift of the Magi". Rarely appears outside the phrase he uttered: "the ironing is delicious".
Example:
Bart: Lisa's in trouble. Ha! The ironing is delicious.
Lisa: The word is "irony".
Bart: Huh?
Bart: Lisa's in trouble. Ha! The ironing is delicious.
Lisa: The word is "irony".
Bart: Huh?