It's rude to butt in line, everyone should wait their turn.
butt in conversation
Frequency:
70
%
I didn't mean to butt in on your conversation, I just had something to add.
Idiomatic Expressions for butt in
Phrase: keep your butt out
Meaning: to stay out of a conversation or situation that doesn't involve you
Usage: I wish she would keep her butt out of our business.