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The Dirty Brontosaurus is where you get someone on their knees, & put their arms behind their head sticking straight up. You then bind the wrist so they can't put their arms down. Use their arms to pull their head toward you forcefully while they give you a BJ.. Finish on their face, or back, or wherever might imply "dirty" to you, then leave them laying face down, arms out, like a long neck Brontosaurus.
She said she wanted to play rough last night, so we played The Land Before Time, & I made her be the dirty Brontosaurus.
by Bring an umbrella January 09, 2016
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