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LingakuLingaku那个……[sentence]
[subject] + 那个…… + [rest of sentence]
那个 is "that one" before a noun, but in speech it also fills a gap while you think, the way "um" or "er" does in English. It is said nèige or nàge, often drawn out.
It can come at the start, before a request or awkward news, or in the middle, right before the word you are looking for. Repeating it, 那个那个, means you are really stuck.
The demonstrative 那个 is followed straight away by a noun or a verb. The filler is followed by a pause, or by a whole sentence that doesn't need "that".
A filler belongs in conversation and in dialogue written to sound like it. In an essay, an email or a message it reads as a slip. 这个 does the same job.