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2.
When someone overacts during a cameo.

First used during a blogtv session with Michael Buckley.
Did you see Fred's hameo in that WhatTheBuck video?
by ThoughtfulOrange June 07, 2009
 
1.
A person who makes a guest appearance, and it is supposed to be a cameo, but they steal all the attention. A work Michael Buckley, aka Whatthebuck, made up on blog tv.
Phil: OMG! Did you see Carl on tv last night?
Lindsay: Yeah! He was a total hameo- I couldn't take my eyes off of him!
by Poopsiechuckle June 19, 2009