Example:
Oh, <em>pardon me</em>! I think I've had too much coke to drink! 
Photo license:
CC: Attribution, Commercial Use
Regionalism:
Neutral
Regional variant:
Neutral
Full Expression:
Etiquette: pardon me
This expression can be used if you burp (make a rude noise through your mouth) after you have eaten or drunk some food and you want to say sorry for that. It is especially polite to say this in front of someone you don't know well.