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When you are using a highlighter, you may become "highlighter happy."
This means that you when you put your highlighter down to highlight, you cannot stop drawing. Soon, your whole paper may be colored with drawings and brightly colored lines.
Guy1: "Dude! What's all over your paper?"
Guy2: "Highlighter, man. I got a little highlighter happy."
by /-/3110 March 06, 2011
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