Definitions
1.nounA steam-powered heavy road roller
2.nounAny heavy road roller
3.noun(by extension) any seemingly irresistible force
4.nounA pipe, used for smoking cannabis, open at both ends and having a bowl near one end; it rolls the smoke (steam)
5.verbTo level a road using a steamroller
6.verbTo proceed ruthlessly against all opposition as if with an overwhelming force; to overpower