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1.
During fornication, the male takes a shit on his partners chest then uses his ball sack to spread the shit around the chest in a smooth, swirling motion. The option of jizzing down the centre of the shit smear is available at this point see tarmacing
Ed loves pulling the steam roller on Matt.
by RICHARD THACKER October 19, 2007
 
2.
The name off a penis, which has the uncanny ability to flatten people, and it is only to be used on women. If they are lucky, they can make it out with a few unbroken bones, but death is the most common side effect of an encounter with 'the steamroller'.
The steamroller left the woman in a coma.
by unknownbyyou456 May 08, 2006
 
3.
The sexual act of Shitting on your partner's forehead, then using your dick to roll the excrement across their face. You can then use the shit as lube for any other sexual act that you desire.
Ben performed The Steamroller on Anabel and she choked!
by BAG1 December 30, 2013