Top Definition
A term used to describe the spontaneous impersonation of Jonathon. Compound word derived from the stem: Impression, and suffix derived from the name: Jonathon.
Often occuring within the forum of a Session.
The improntosaur: "I mean, that is juust... you know... unbelievable! Hiiiiiiigh!"
Audience: "(laughter) Mate that was a well good Impronathon!)
by Mini-Sue September 19, 2004
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