whatsit
noun
[ ˈwɒtsɪt ]
• a person or thing whose name one cannot recall, does not know, or does not wish to specify.
• "Let's say two o'clock on the whatsit of May?"
Similar:
thing,
so-and-so,
whatever it is,
whatever it is called,
whatnot,
what-d'you-call-it,
what's-its-name,
whatchamacallit,
thingummy,
thingy,
thingamabob,
thingamajig,
oojamaflip,
oojah,
gizmo,
gubbins,
doings,
doodah,
doobry,
doodad,
doohickey,
doojigger,
dingus,
hootenanny,
thingo,