DnB step, also referred to as "DnB dance" and "drumstep" is a weird kick-ass mix between c-walk and jumpstyle, mostly danced by eastern europeans, for some reason. Probably because it's freezing to death there and they need some way to heat themselves up.
Practitioners are usually referred to as "steppers", "junglists" and/or "drumsteppers". A well-document step would be "X-outing", where they look like bunnies hopping around without actually leaving the same spot.
"I went to youtube
and saw these crazy russian teens doing a weird yet slightly arousing dance
" - Your friend
"yeah it's called dnb step/drumstep" - you