thingydoodle 

Something you can't remember the name of.

Me: Are you going to that dance at the thingydoodle?
Isabel: I dunno. Are you?

thingydoodle by D.A.N.C.E. November 9, 2006

thingerdoodle 

Used to unspecifically refer to items just outside of your physical and mental reach.

Pass me the thingerdoodle, you know, the thingerdoodle.

thingerdoodle by Mike Wirth March 4, 2008