from the cartoon Ed, Edd and Eddy. Let's not and say we did, is a way of saying
NO! to someone. Usually, the person's first name
will be added to the end of the sentence.
*ed has just swallowed the video camera and Edd had retrieved it from his stomach*
Ed: I can't wait
to see that
on video double
Edd: let's not and say we did ed!
Steve: hey tom let's go and dive
bucket of cement.
Tom: Let's not and say we did Steve!