whatchamacallit

(ˈʍətʃəməˈkɑlɪt)

n. a name for a person or thing whose real name has been forgotten or is being avoided. I lost my—you know—my whatchamacallit—my watch!

Name	Pronounced	Usage
Uma	-	Hinduism, Indian, Telugu, Kannada, Malayalam, Tamil, Hindi
Lyra	LIE-rə (English), LEE-rə (English)	Astronomy
ĐUraĐA	-	Serbian, Croatian (Archaic)
Synne	-	Norwegian
Hildegarde	['hildəga:d]
Ableson	['eiblsn]