Definition of "filcher"

But to return — Poor Paddy had a wife, The very plague and torment of his soul,The harbinger of battle and of strife, And, what was worse, the filcher of his bowl ;

1820 August, Daniel O'Rourke, “An Epic Poem, in Six Cantos”, in Blackwood's Edinburgh Magazine, volume 7, number 41, page 35

Well, she sneaks around the world from Kiev to Carolina / She's a sticky-fingered filcher from Berlin down to Belize

1991, “Where in the World Is Carmen Sandiego?”, Sean Altman, David Yazbek (music), performed by Rockapella