something that stripped of all sounds, where the drum and the bass just "roll" thru the tune. Like a tune you could hear for an hour and never get sick of how it rolls thru
Back in the day[early to mid 90's: )] a "Roller" referred to the the Break that consisted of Drum rolls linked together & often in conjunction with an Amen over the top but nowadays it seem's to have morphed in tracks like 'The Cleaner' by Hybris etc.