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The act of thinking something through in your mind, usually a phrase or sentence, before actually saying it. This is usually advised by someone when a person starts spurting out random thoughts that make absolutely no sense, and add no value to the current conversation.
Guy 1: Sometimes for to being smarter, is for to being deader.

Guy 2: Dude, first you've got to mentalate it, then put it out.
by C. Scully July 28, 2008
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