Definition: an electrical apparatus that by means of suction collects dust and small particles from floors and other surfaces.
The earliest ASL sign was captured at age 0;11. She not only signed it but also the 'raspberry' mouth morpheme was accompanied. The movement was long and continuous (but the video was cut early).
In the video, she was pointing to the vacuum cleaner and then signing it. With the advantage of this 3-dimensional modality of language and the nature of the ASL sign, the mother played language, "sucking" and tickling the baby.