This is a quote from The Tempest by Stephano:
Be you quiet, monster.—Mistress line, is not this my jerkin? Now is the jerkin under the line.
And it is translated (according to this source) into:
Be quiet, monster. Madame clothesline, isn't this my jacket? Thank you kindly. Now the jacket is under the line.
What is in the original text that translates to anything like expressing thanks?