arse
noun
[ ɑːs ]
• a person's buttocks or anus.
• a stupid, irritating, or contemptible person.
arse
verb
• have enough interest or enthusiasm to do something.
• "I need to cut the grass, but I can't be arsed to do it just yet"
Origin:
Old English ærs, of Germanic origin; related to Dutch aars and German Arsch . See also ass2.
arse around
• behave in a stupid way; waste time.