lounge lizard

Short definition from Wiktionary

Noun

1. 1
   An idler or pleasure-seeker; a person who spends considerable time loitering in bars and cocktail lounges.
2. 2
   A lounge singer, especially in Las Vegas.
3. 3
   A person who spends a lot of time sitting or lying down, often watching television, eating snacks or drinking alcohol.
4. 4
   Alternative spelling of lounge lizard.