Top Definition
Where you shit on a female's chest and then proceed to act like a veloco-raptor guarding a freshly laid dinosaur egg.
Fred was so chuffed. After he laid that brontosteamer on Wendy's chest, he stayed up all night keeping watch for the Turdburglar.
by Jatchy McJatch Jatch December 28, 2009
5 Words related to brontosteamer

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