Whatchamacallum is a colloquial term often used to describe an object or item for which one does not know or cannot recall the name. Several synonyms may be used to replace the word whatchamacallum, including thingamajig, gadget, gizmo, contraption, device, or implement. These words are often used in informal contexts and are widely recognized for their ability to convey the same meaning as whatchamacallum. Additional synonyms for whatchamacallum may include doohickey, doodad, thingamabob, widget, or apparatus. Regardless of which synonym one chooses to use, these words serve as a common language for individuals to communicate when they cannot remember the name of an object.