Top Definition
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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