I seem to recall an episode where someone (Bart?) says something where he starts off saying "chums" but after dragging out the m sound tacks on a ps, making chumps. i.e. like the subject of this post. And whoever was on the receiving end of this comment was pleased at first when they thought Bart was saying chum, but then got upset when he turned it into chump.
Maybe this was a different show, or it never happened altogether. Anyhow, if you remember something like this please let me know. Thanks