An urge to do or say something that might be better left undone or unsaid(noun)
WordNet. Princeton University. 2010.
Use "irresistible impulse" in a sentence
"Germany, who yielded to the irresistible impulse that appears to have been gradually communicated from the eastern extremity of the continent of Asia."
"If the heavenly delight be stronger than the opposing earthly one, it overcomes as efficacious grace (gratia efficax s. magna), the will with an irresistible impulse for good."
"It spiritualizes the irresistible impulse which draws one man to another, and it raises the social connection of human beings from the sphere of a convention to that of a moral obligation."