need/want somebody/something like a hole in the head

need (something) like (one) needs a hole in the head

To have absolutely no need or use for something. I'm perfectly happy having a cell phone that just makes phone calls—I need a fancy new smartphone like I need a hole in the head. We have enough problems with the business as it is, so we need an audit right now like we need a hole in the head.
See also: head, hole, like, need, needs
Farlex Dictionary of Idioms.

need something like a hole in the head

or

need something like you need a hole in the head

INFORMAL
If you say that you need something or someone like a hole in the head or like you need a hole in the head, you mean that you do not need or want them at all. I need more publicity like a hole in the head. We need an interest rate rise like we need a hole in the head. Note: This is said to be a translation of a Yiddish expression. It became more widely known following the play `A Hole in the Head' (1957) by Arnold Schulman, and a film of the same name starring Frank Sinatra (1959).
See also: head, hole, like, need, something
Collins COBUILD Idioms Dictionary, 3rd ed.

need something like a hole in the head

used to emphasize that someone has absolutely no need or desire for something. informal
See also: head, hole, like, need, something
Farlex Partner Idioms Dictionary

need/want somebody/something like (you need/want) a ˌhole in the ˈhead

(informal) definitely not need/want somebody/something at all: I had to get home before midnight, and just then I needed a flat tyre like a hole in the head.
See also: head, hole, like, need, somebody, something, want
Farlex Partner Idioms Dictionary
See also:
  • need (something) (about) as much as (one) needs a hole in the head
  • need (something) like (one) needs a hole in the head
  • need like a hole in the head
  • need something like a hole in the head
  • need (something) (about) as much a fish needs a bicycle
  • need (something) like a fish needs a bicycle
  • park that thought
  • What can I do for you?
  • cry out for
  • cry out for (someone or something)