To pass out can have several meanings.
To lose consciousness (intransitive = without object)
Example sentences:
- I drank too much vodka and passed out.
- John pass out after being hit hard in the head.
To distribute something (transitive, with an object)
Example sentences:
- Questionnaires were being passed out at the shopping center to all shoppers.
- Face-to-face fundraisers were passing out leaflets on the street.
To graduate (of policemen, soldiers etc.) market by a ceremony after training (in the UK and the Commonwealth)
Example sentences:
- The passing out parade was impressive. The cadets had all passed out in style.