thingamabobnoun [ C ]
uk/ˈθɪŋ.ə.mə.bɒb/us/ˈθɪŋ.ə.mə.bɑːb/also thingamajig, , UK also thingummy, informala word used, especially in spoken English, when the name of an object has been forgotten:
I need one of those red thingamabobs for this - Do you have one?
See also
thingy