barge in

barge in  {v. phr.},  {informal}
To appear uninvited at someone's house or apartment, or to interrupt a conversation.
I'm sorry for barging in like that, Sir, but my car died on me and there is no pay phone anywhere.
I'm sorry for barging in while you two are having a discussion, but could you please tell me where the nearest exit is?
Categories: {informal} {v. phr.}