Top definition
An attitude combining simmering anger on the verge of explosion with the subsequent inevitable progression of attitude into verbal explosion- hence the rant.

To be boiling beneath the surface with only the slightest skin of resistance between restraint and going postal.
After being dumped by his girlfriend for a state trooper, Todd was the picture of simmerant when he was pulled over on the way home by the very same trooper.

by Kishote November 28, 2005
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