just cut in front of me

[Silverobama]

Hi.

I was waiting in a line and someone suddenly appeared in front of me, wanting to jump the queue. I then said "You just cut in front of me".

I wonder if it's natural.

[teechar]

No, because they haven't actually carried out that action yet.
Try:
"Excuse me! There's a queue here, if you hadn't noticed".

Assuming that they did actually do it, then your sentence would be fine.
In that case, consider also:
"You've (just) jumped the queue".

[Yankee]

If they "appeared in front' of you", then they obviously "cut in front" of you. So, yes, correct and natural.

[emsr2d2]

Hi.

I was waiting in a line and someone suddenly appeared in front of me, wanting to jump jumping the queue. I then said "You just cut in front of me".

I wonder if it's natural.

If they were in front of you, they had already jumped the queue.

BrE speakers might say "You just pushed in in front of me!" (That would be the polite version! )

[Yankee]

As an AmE speaker, the use of "pushed" in that context would imply that there was physical contact.

[emsr2d2]

As an AmE speaker, the use of "pushed" in that context would imply that there was physical contact.

It's not "pushed" though. It's "pushed in" - phrasal verb.

[GoesStation]

It's not "pushed" though. It's "pushed in" - phrasal verb.

Right. That doesn't suggest physical contact to my American ears.

[Yankee]

Right. That doesn't suggest physical contact to my American ears.

Well, my AmE(ars) sense otherwise.

[emsr2d2]

The reference section of UE shows "push in" as used internationally. See HERE.

[Phaedrus]

Assuming that they did actually do it, then your sentence would be fine.
In that case, consider also:
"You've (just) jumped the queue".

Or, less confrontationally:

Excuse me. Are you aware that the line starts back there?

(As an AmE speaker, I use "line" rather than "queue.")