have a finger in every pie字面意思是“在每一个派中都有手指”，通常被用来引申为“多管闲事；到处干预 ”的意思。

【例句】
Don't have a finger in every pie, it's none of your business.
不要多管闲事，这不是你的事情。

He very much likes to have a finger in every pie.
他很喜欢什么事都插上一杠。