A word used when the actual name of the object in questionwill not come to mind. Very versatile but often very vague. It is derived from the phrase "what-you-may-call-it" which can be found in T. H. White's The Once and Future King.
Claire- "Hey, Adam, hand me the- the- you know, the whachamacallit."
This is a word used on spring break. It is used to find your homies and where they are located in a large group of people. Using whowha you are gauranteed to find your friends when you are by yourself on spring break.