/hooh"zis/ , n. , pl. whoosises . Informal.
1. an object or person whose name is not known or cannot be recalled: It's the whoosis next to the volume control.
2. a person or thing considered typical or illustrative: the usual paragraph about the party given by Mme. Whoosis.
Also, whosis .
[ 1920-25; alter. of phrase who's this ]