Used to proclaim oneself as being totally manly, usually after having performed an amazing feat.
"Did you see that goal, I'm a total mastodon!!"
by Junkyard Dog July 01, 2004
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n. A very large penis.
I saw no way he was going to fit his Mastodon Hose inside me. Huge!
by saint_adventure October 03, 2014
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To be so filled with seething angst and rage, your only thought is to utter a gutteral growl, like a Mastodon.
Teacher: "Timmy, you have failed the test..."

Student: "URRRRRRRRRRRRG!!!!"

Teacher: <Blown Away>
<A Prime example of a Mastodon Rage situation>
by Aut0matic M16 April 04, 2010
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MASSIVE tits. Boobs of such grand proportions that they could knock someone out if the women possessing turns around too fast. You can hear the milk swooshing within the tits because there is so much extra space within.
Don't get too close when you surprise her, if she spins too fast and you're within range of the Mastodon Tits, they'll send you to the moon!
by eggnog superstar November 19, 2012
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When a man another man with a strap on dildo while masturbating both his and his partners penis.
Yo Billy was mastodoning me last night and the whole bottom half of my body is numb.
by Mastodonmaster May 11, 2017
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