It’s a programming joke. If you declare variables or set a value to a space in the storage, this space is blocked even after the programme is done using that variable. So to write a programme with efficient use of storage, you have to free the storage space after you are using it.

Many programming languages use a routine called “garbage collector” to free unused storage space.

So, if you don’t want to be a garbage collector, you have to assign storage space manually.