Queen of She‧ba, the /ˌkwiːn əv ˈʃiːbə/ noun

1. someone who is very rich or who spends money as if they were very rich, from a story in the Old Testament of the Bible about the wealth of the Queen of Sheba

2. and I’m the Queen of Sheba humorous used as a reply when someone claims that they are famous or that they have done something impressive, but you do not believe them:
‘I’d like to reserve a table for tonight – this is Demi Moore.’ ‘Oh yeah, and I’m the Queen of Sheba.’

[TahlilGaran] Dictionary of Contemporary English ▲