That's what I was thinking, I don't quite know about "nito-groups" other then it has nitogen in it, but I get the feeling it blows up a lot, and that's good enough for me (to read about, not acually try this)
In chemical terms, nitro groups are -NO₂, which puts the nitrogen atom (which usually wants to attract electrons) at the oxidation state of +5. This makes nitro groups likely to be explosive, since nitrogen wants to return to a more neutral oxidation state (more specifically, elemental nitrogen, N₂ with its very stable triple bond), and will tend to do so exothermically and rapidly.
The desire to return N₂ quickly also makes N-N and N=N single and double bonds very likely to make compounds explosive, because those bonds are already well on their way in the quest for stability and will happily release lots of heat as they do so. See the hexanitrohexaazaisowurtzitane mentioned in the article--it's full of -N-NO₂ groups! And, naturally, it blows up.
The desire to return N₂ quickly also makes N-N and N=N single and double bonds very likely to make compounds explosive, because those bonds are already well on their way in the quest for stability and will happily release lots of heat as they do so. See the hexanitrohexaazaisowurtzitane mentioned in the article--it's full of -N-NO₂ groups! And, naturally, it blows up.