Monkey's uncle
Michael Quinion notes that the phrase "Monkey's uncle" occurs in a parody of Longfellow's "The Song of Hiawatha" which was reprinted in James Parton's "The Humorous Poetry of the English Language" , published in 1881 , and observes: "This may be just an accident of invention , but the date fits" . 
<triplet> Longfellow <subj> The Song of Hiawatha <obj> notable work <triplet> The Song of Hiawatha <subj> Longfellow <obj> author