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Emoji have been ubiquitous in communication for over a decade, yet how they derive meaning remains underexplored. Here, we examine an aspect fundamental to linguistic meaning-making: the degree to which emoji have conventional lexicalized meanings and whether that conventionalization affects processing in real-time. Experiment 1 establishes a range of meaning agreement levels across emoji within a population; Experiment 2 measures accuracy and response times to word-emoji pairings in a match/mismatch task. In this experiment, we found that accuracy and response time both correlated significantly with the level of population-wide meaning agreement from Experiment 1, suggesting that lexical access of single emoji may be comparable to that of words, even out of context. This is consistent with theories of a multimodal lexicon that stores links between meaning, structure, and modality in long-term memory. Altogether, these findings suggest that emoji can allow a range of entrenched, lexicalized representations.