Definition of "steamroller"

steamroller

noun
plural steamrollers
1. (historical) A steam-powered heavy road roller.
2. (by extension, informal) Any heavy road roller.
3. (figurative) Any seemingly irresistible force.
  Quotations
  Well, I'm a steamroller, babe / I'm bound to roll all over you
  1970, James Taylor (lyrics and music), “Steamroller Blues”
4. (slang) A pipe, used for smoking cannabis, open at both ends and having a bowl near one end.
  Quotations
  It's more about him testing his wares. He rolls joints. He doesn't own a bong, hookah, smoking pipe, chillum, vaporizer, scale, dugout system, grinder, or steamroller.
  2005, Jane Smiley, John Kulka, Natalie Danford, editors, Best New American Voices 2006, Houghton Mifflin Harcourt, page 242
verb
third-person singular simple present steamrollers, present participle steamrollering, simple past and past participle steamrollered
1. To level a road using a steamroller.
2. To proceed ruthlessly against all opposition as if with an overwhelming force.