Whosis is a colloquial term used to refer to someone whose name or identity is unknown or forgotten. It is often used in a casual or humorous way to describe a situation where an individual's name or identity is not immediately apparent. Synonyms for whosis include whatshisname, whatshername, thingamajig, and thingamabob. These terms are often used interchangeably to refer to someone whose name or identity is elusive. Other synonyms for whosis include anyone, somebody, and nobody in particular. Regardless of the term used, the common thread is the lack of knowledge or familiarity with the individual in question.