Metathinking is the act of overthinking the concept of overthinking. This also includes any and all advanced layers of thinking, so long as there is more thank one.
Metathinking typically involves a scenario in which the metathinkee can make no difference, such as an impending examination, interview, or relationship quandary.
"Dude, Brandy hasn't texted me in like a month. Do you think it was something I said? Or maybe she found another man. Shit. I don't know. I shouldn't think about it any more. Do you think i am overthinking things? I can't tell. "
"Shut up, and stop metathinking. That only makes things worse."