The definition of a hang-up is a slang term for the source of a person's emotional or personal problem.
An example of a hang-up is a person thinking their partner is always cheating on them because they've been cheated on in the past.
Slang a problem or difficulty, esp. one of a personal or emotional nature that a person seems unable to deal with
- A psychological or emotional difficulty or inhibition.
- An obstacle to smooth progress or development.
- Alternative spelling of hang-up.