Swamp Mushy Muddy is a swampy area where Grouches can go fishing, or even on vacation. It is also where Oscar spent his vacation during 1970 which turned his fur from orange to green.
A grouchy Sesame Street song featuring Oscar the Grouch backed up by 2 witches explains the great pleasure Grouches have whilst on vacation at Swamp Mushy Muddy.
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