bit的意思是“一小块”，love to bits字面意思爱到碎块，引申为非常喜爱，特别喜欢。

【例句】
He's my old man and I love him to bits but I can't spend too much time with him.
他是我老爸，我很爱他，可是不能跟在一起时间太长。

I'm so proud of her. I love her to bits.
我以她为荣，我爱死她了。