Definition of mouseburger in English:

mouseburger

noun

US
humorous
  • A young woman of unexceptional appearance and talents, regarded as timid, dowdy, or mousy; (originally) such a person who can nevertheless achieve professional and personal success through determination.

Origin

1970s; earliest use found in The Cleveland Plain Dealer. From mouse + -burger.

Pronunciation

mouseburger

/ˈmaʊsˌbəːɡə/