It is used to call someone attention or a way of apology. It is also used to get someone out of the way.
Eg.2: imin: hey you pretty
AH EXCUSE MEEE!!
Eg.2:
excuse me! Move out the way please
Excuse me Beau? Might not want to stalk me you filthy grot
Go brush your teeth you fucking grot
A word said by the legend himself, JIMIN FROM THE MOST POPULAR GROUP BTS
Jimin: h-hey how much is dis
JUNGKOOK: Nono Excuse me!-
Jimin: EXCUSE ME OH HEY YEAH COME ON
If you're wondering why im standing here, you're in my way.
Something incompetent people use to identify themselves among others
oh bobby go ahead to peach on me