So I went into the console today because I felt like blowing a lot of [censored] up. So I searched "mini" and started spawning a bunch of mini nukes.

I noticed though that as I picked them up, my fatman wasn't getting any ammo. So I was thinking, 'where the hell are all these mini nukes going?'

As it turns out, there is a mini nuke melee weapon... It weighs 0 pounds and is worth 50 caps. That's right people, I don't know where the hell one can find these things without using a console, but those chunky mini nukes can be used to beat people to death!

it's probably the Suicider bombs, Beth probably made it an exclusive object for them to use and attached some script to blow up once they near a target.

yeah, when they do their suicide thing, you can actually see them do a 'slam dunk' type melee animation just before the boom, and even interrupt it mid swing to save your bacon. its clearly tied to the melee attack. I suspect that those are the mininukes they use, though normal ammo-type ones are what they drop if you pop them before they go boom.