Word for someone talking about something as if he understands it when he doesn't


Not someone overstepping boundaries, but if, for example, I was at Jiffy Lube and suggested different things as if I knew anything about cars.


Ideally (though I know it's a long shot) I'd want a word I could use when I caught myself doing it (i.e. not super derogatory, but acknowledging the social gaffe).



Sorry, I don't actually know anything about cars; I'm just [being a] __.





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