TACO noun 1phrase 1forms 1phrases 2 noun1 •Initialism of transfusion-associated circulatory overload. phrase1 •(US) Acronym of Trump always chickens out.This is the TACO theory: ["]Trump Always Chickens Out," Armstrong wrote on May 2. — 2025 formsTACOs Phrases with TACO blow this taco standTo exit or remove oneself from a less than exciting location or environment. TACO outOf Donald Trump, to pause or back down from aggressive policies.