a way to describe an object when the words don't come to mind(usually done while pointing). similar in meaning to doo-hickey.
I could not remember the name of the object, so I looked at my friend, pointed, and asked him to pass the thing-a-ma-jig.
A word you say when you can't think up a name of a paticular noun, or you've forgotten the name of something.
Gohan: Hey, dad! Krillin is killed by Frieza, remember back in Namek?
Goku: Oh, yeah! You're right son! We gotta find a way to get him back and it's with those orange thing-a-ma-jig with the stars on it
Gohan: ......You mean a dragonball?.....>_>
Goku: Oh, yeah! That's right! Let's go!
*Uses Instant Transmission*