so and so
[adjective]
Synonyms: damned, blamed, blankety-blank, blasted, bleeding, cursed, dad-blamed, dad-blasted, dad-burned, dang

[TahlilGaran] English Synonym Dictionary ▲

ˈso-and-so noun

1. [uncountable] used to refer to a particular person or thing when you do not give a specific name ⇒ such and such:
I’d find myself thinking, ‘I wonder what so-and-so is doing?’

2. [countable] a very unpleasant or unreasonable person – used when you want to avoid using a swear word:
Peter can be a real so-and-so at times.

[TahlilGaran] Dictionary of Contemporary English ▲

so and so
pronoun, informal Someone whose name is not given.
Don't tell me what so-and-so thinks. Tell me what you think.
n., informal A person of a special kind and usually of a very bad kind.
■ This word is used in place of a more unacceptable word or swear word.
I wish that old so-and-so who thinks digging is easy work was right here digging now.
He called me a dirty so-and-so and I hit him in the mouth.
■ Sometimes used in a joking way.
Peter met his friend John and said, "Hello there, you old so-and-so."

[TahlilGaran] English Idioms Dictionary ▲