"In your head", especially if it is negative.
"Look at that sadboy, he's got too many malacious thoughts and its got him real depressed."
The equally asinine counter term to "mansplain," (of a woman) to explain herself in an overly complex or unnecessarily verbal fashion, usually in an attempt to try and make a point by looking smart, or because she simply can't stop talking.
My wife goes to book club and she always has to use a 6 syllable word every other word. I wish she'd stop womansplaining her stories to me.
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