1.
You use ~ instead of a word, expression, or name when you are talking generally rather than giving a specific example of a particular thing. (INFORMAL)
It would be a case of ‘just do ~ and here’s your cash’...
If Mrs So-and-so was ill then Mrs So-and-so down the street would go and clean for her.
PRON
2.
People sometimes refer to another person as a ~ when they are annoyed with them or think that they are foolish. People often use ~ in order to avoid using a swear word. (INFORMAL)
All her fault, the wicked little ~.
N-COUNT disapproval