Heard someone speaking in Russian and they used a word that was pronounced dead - guy wondering if anyone knows what its meaning is?

You're likely thinking of the Russian word "дед" (ded), which is pronounced similarly to "dead" in English. However, it means "grandfather" in Russian.

It's a common mistake for English speakers to misinterpret this word, as the sounds are quite similar.

If you can remember more context, like the sentence it was used in, it might be easier to figure out the exact meaning.