As a language expert with a deep understanding of idiomatic expressions, I can provide you with a comprehensive explanation of the phrase "to eat someone up."

In English, the phrase "to eat someone up" can have different meanings depending on the context in which it is used. Here are two common interpretations:

1. **To consume someone with great interest or enthusiasm**: When you say you are eating someone up, it can mean that you are listening to them with rapt attention or are very interested in what they are saying.

2. **To be very upset or distressed by someone's actions**: This is a more figurative use of the phrase, where "eating up" refers to the emotional turmoil or distress caused by someone's behavior.

Here's the explanation separated by "read more >>

Meaning "to preoccupy, engross" (as in what's eating you?) first recorded 1893. Slang sexual sense of "do cunnilingus on" is first recorded 1927. ... The slang phrase to eat one's words is from 1570s; to eat one's heart out is from 1590s; for eat one's hat, see hat.read more >>