Who are prolific liars and what are their defining characteristics? Prior work suggests prolific liars tend to be younger and self-identify as male compared to everyday liars, but little research has developed a theory of prolific liars beyond demographic data. Study 1 (N = 775) replicated the prior demographic effects and assessed prolific liars through their situational (e.g., cheating), dispositional (e.g., Dark Triad traits), and communication characteristics (e.g., language traces, interpersonal perceptions of dishonesty). Prolific lying associated with more cheating, the use of fewer adjectives, and being high on psychopathy compared to everyday lying. Study 2 (N = 1,022) largely replicated these results and observed a deception consensus effect reported in other studies: the more that people deceived, the more they believe others deceived. This piece concludes with a theoretical explication of prolific white and big liars, combining evidence that identifies them through situational, dispositional, and communication characteristics.