Movies
Since I was the one that smelt it, I would forever be... the one that dealt it.
— The Spleen • Mystery Men

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
A rhyming joke about blame. Whoever announces the smell gets stuck with the reputation, so the speaker fears being permanently seen as the culprit. The humour comes from the childish rhyme delivered like a grim life sentence.
Context reviewed