Home › Words › O › outbrainoutbrainoutbrain means to exceed in mental ability; to be cleverer than.Among words judged in Lexicurio's Arena, outbrain ranks #1,641 of 42,749 for Qualifying.EtymologyFrom out- + brain.verbTo exceed in mental ability; to be cleverer than.Definitions & examples from Wiktionary (CC BY-SA 3.0).