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 whatchamacallit."
CHILLIN! FUCK! ALWAYS WORRIED ABOUT WHAT THE FUCK I'M DOING! STAY OFF MY DICK HOE! WE FUCKED ONCE AND NOW YOU TELLING ALL YOUR MESSY ASS FIRESIDE BITCHES YOU LOVE ME AND SHIT! ALL WE DID WAS FUCK THATS IT! SHIT BITCH ION WANT YOU! ME BUFORD FERB AND BALJEET HAD YOUR WIDE PUSSY ASS! GTF OUT MY FACE BITCH BREATH SMELLIN LIKE DOOFENSHMIRTZ BALLS AND SHIT!