A short phrase utilized primarily by highly intelligent and sophisticated human beings, especially those with two X chromosomes. Unlike the also popular "Can you not...", this unique phrase ends immedietely after "not" and may be phrased both as a question and as a statement. The speaker should assume that whomever he/she is conversing with is completely aware of the misdemeanor.
Matthew has just provoked Jackie and she is mildly annoyed and amused (but mostly annoyed).
Jackie & Eva (in unison): Can you not?