French phrase
Puis-je vous tutoyer ?
Meaning
May I address you informally?
When to use it
A brief request to use informal address. It is casual and leaves room for refusal.
Example dialogue
Puis-je vous tutoyer ?
May I address you informally?
Oui, bien sûr, vous pouvez me tutoyer.
Yes, of course, you may address me informally.