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Overclaiming—in which individuals overstate their level of familiarity with items—has been proposed as a potential indicator of positive self-presentation. However, the precise nature and determinants of overclaiming are not well understood. Herein, we provide novel insights into overclaiming through 4 primary studies (comprising 6 samples) and a meta-analysis. Based on past empirical work and theoretical discussions suggesting that overclaiming may be the result of several processes—including an egoistic tendency to self-enhance, intentional impression managing behavior, and memory biases—we investigate various potential dispositional bases of this behavior. We hypothesized that overclaiming would best be predicted by a dispositional tendency to be curious and explorative (ie, high Openness to Experience) and by a dispositional tendency to be disingenuous and self-centered (ie, low Honesty-Humility …