How is “while you're at it” used?

In Monty Python's The Meaning of Life (1983), one line is: “Oh, and while you're at it, you'd better get a doily.”

Which movie is “while you're at it” from?

The clip at the top of this page is from Monty Python's The Meaning of Life (1983).

used to suggest that sb could do sth while they are doing sth else

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used to suggest that sb could do sth while they are doing sth else

Definiciones del Oxford Advanced Learner's Dictionary, 9.ª edición

Oh, and while you're at it, you'd better get a doily.

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