shitting your pants and then walking around and denying that you shit your pants even though everyone can clearly tell that you shit your pants, and if anyone accuses you of shitting your pants, you tell them that in fact THEY shit your pants and that this part of some conspiracy against you to fill your pants with shit even though you're simultaneously claiming that there is in fact no shit in your pants. Then, out of misplaced loyalty, about 1/3rd of people convince themselves that somehow you're not obviously lying to everyone and so you then tell these foolish people that it's actually chocolate in your pants and then make them eat your shit in front of you
Making a claim or offering an opinion on a subject for which you have absolutely no experience or knowledge; Talking out of your ass; Derived from the surname Trump for obvious reasons. Always capitalized to distinguish from the homonym trumping.