This is the 5762nd most frequent Japanese word.
どっか
"どっか" means "somewhere" or "someplace" in casual speech.
In this sentence, 'どっか' refers to an indefinite place or 'somewhere,' showing desire for any random destination.
どっかに行きたいな。
I want to go somewhere.
Here, 'どっか' indicates an unspecified location where something was previously observed, useful in recalling vague memories.
どっかで見たことがある。
I have seen that somewhere.
In this usage, 'どっか' conveys an unspecified location where the wallet seems to have disappeared to, often used in casual speech for misplaced items.