Did you mean thingamajig?
thingamajig
noun
°Something that one does not know the name of.
"He used this, this... this thingamajig you saw him with the other day to fix the problem."
synonyms: gizmo, jobbyjobber, whatchamacallit, whatshumacallit more» , thing, thingamabob, thingy, hoobajoob, doojigger