Let's Not And Say We Did Meaning

(idiomatic, colloquial, usually sarcastic, dismissive) Indicates that the speaker does not agree with a proposed action, and does not wish to participate.

Example: 1926, Maxwell Bodenheim, Ninth Avenue, H. Liveright, page 30:
  "Let's not and say we did," he answered, moodily.
1947, James Thomas Farrell, The Life Adventurous, Vanguard Press, page 286:
  "Let's kick in a window on George," Dick Buckford said.
"Let's not and say we did," Andy Houlihan said.
2006, Jane A. G. Kise, Differentiated Coaching: A Framework for Helping Teachers Change, Corwin Press, ISBN 1412916437, page 65:
  Many teachers take a "Let's not and say we did" attitude toward extended experiential learning in the different styles.