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 Today's Phrase: 

Couch potato

Meaning: 

• Used when someone watches too much television.
•  a person who takes little or no exercise and watches a lot of television
  

Explanation:

This was created for someone watching too much television because in some western countries, a person usually sits on the "couch" and eats "potato" chips while watching television.

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Example:

1. My husband is a couch potato. He sits in front of the TV all day long.

2. You have a huge belly because you're a couch potato.

3. I should be more active and less of a couch potato. 

Reference: Talkenglish