a walking

a walking (something)

The living embodiment of something; a person who has or displays the characteristics of something. First, I lock myself out of the house, then my grocery bag breaks in the parking lot, and now I stepped on my glasses—I'm just a walking disaster today! If you've ever had to spend a lot of time with kids, you know they're basically just walking petri dishes of germs and bacteria.
See also: walking
Farlex Dictionary of Idioms.

a walking

If you describe someone as a walking something, you mean that they are an example of that thing or have the characteristics of that thing. She was seen by both lay people and clerics as a walking miracle. Wayne is a walking disaster.
See also: walking
Collins COBUILD Idioms Dictionary, 3rd ed.

a walking —

someone who notably embodies the characteristics of something. informal
1989 Charles Shaar Murray Crosstown Traffic He is…a dubious political philosopher and a walking disaster area as a businessman.
See also: walking
Farlex Partner Idioms Dictionary
See also:
  • a walking (something)
  • (I) wouldn't (do something) if I were you
  • a fast talker
  • a/the feel of (something)
  • all righty
  • a straw will show which way the wind blows
  • a crack at (someone or something)
  • (you've) got to get up pretty early in the morning to (do something)
  • all right
  • (you) wanna make something of it?