Detonator would be a 'gun' that would shoot out the little slime jelly bombs that are dropped fairly frequently by some enemies. Detonator's jelly bombs would not detonate on their own.
Detonator's charge would be to detonate things, hence the name. It's own small explosives, as well as all bombs, catalyzer bullets, alchemer charges, etc. would instantly go off, regardless of where they are. This would require team coordination, and would allow for mild trolling, but would ultimately be a fun feature for bombers to benefit from.
I don't like how it detonates everything, just the items it shoots. Other than that, it's an interesting concept.