The word "thingum" is a colloquial term used to refer to an object or item whose name is unknown or forgotten, or when the speaker is uncertain or hesitates to name a particular thing. Some synonyms for "thingum" include "whatchamacallit," "doodad," "gizmo," "widget," "doohickey," "whatnot," "contraption," "apparatus," "odds and ends," "trinket," "bauble," and "knick-knack." These words are often used in informal conversation or when someone cannot remember or does not know the specific name of an object. Despite their lack of precision, these terms provide a playful and humorous way to refer to everyday items and objects.