on s'est bien amusé

we had a good time

→ on
phrase Rare #46,078
we had a good time A common conversational expression meaning that everyone enjoyed themselves. Although on literally means “one,” it commonly means “we” here; amusé agrees with the subject and is often written amusés when on clearly refers to a mixed-gender or all-male group.
FR: On s'est bien amusé pendant le voyage.
EN: We had a great time during the trip.

On s'est bien amusé.

We had a lot of fun.

On s'est bien amusé ensemble, non?

We had a great time together, didn’t we?

On s'est bien amusé à jouer au foot.

We had a great time playing soccer.

On s'est bien amusé à la fête.

We had a great time at the party.