1. To be wiped out very quickly without any pause in the attack. Often used on capture maps in Team Fortress.
2. Rapid, continuous destruction, often with a certain destination in mind.
3. An incredibly quick, very destructive lost that often seems comical.
Red Team: Defend the point nubs.
*Loses first point*
Red Team: WTF was that shit nubs, get on the second point!
*Loses next point in next minute*
Blue Team: Lol, steamrolled.
After you take a large hit of marijuana from a steamroller pipe and you can't stop coughing. And therefore that person got steamrolled
"Tim! You just got STEAMROLLED!"