meddle

余計世話だよ！(よけいなおせわだよ！)	Mind your own damn business!! $$$

干渉(かんしょう)	To interfere. Less angry than 余計なお世話だよ！ For instance, 干渉 also applies to science, like radio interference or electrical interference. Also, 干渉 has the nuance of ‘get mixed up in’. A parent could tell their child, “Don’t get mixed up in a fight your friend is having with your other friend. Let them handle it themselves.”