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Life science has progressed with applications of fluorescent probes—fluorophores linked to functional units responding to biological events. To meet the varied demands across experiments, simple organic reactions to connect fluorophores and functional units have been developed, enabling the on‐demand selection of fluorophore‐functional unit combinations. However, organic synthesis requires professional equipment and skills, standing as a daunting task for life scientists. In this study, we present a simple, fast, and convenient strategy for probe preparation: co‐aggregation of hydrophobic molecules. We focused on tetrazine—a difficult‐to‐prepare yet useful functional unit that provides effective bioorthogonal reactivity and strong fluorogenicity. Simply mixing the tetrazine molecules and aggregation‐induced emission (AIE) luminogens in water, co‐aggregation is induced, and the emission of AIE luminogens is quenched. Subsequent click reaction bioorthogonally turns on the emission, identifying these coaggregates as fluorogenic probes. Thanks to this bioorthogonal fluorogenicity, we established a new time‐gated fluorescence bioimaging technique to distinguish overlapping emission signals, enabling multi‐organelle imaging with two same‐color fluorophores. Our study showcases the potential of this co‐aggregation method for the on‐demand preparation of fluorescent probes as well as protocols and molecular design principles in this approach, offering an effective solution to evolving needs in life science research. [ABSTRACT FROM AUTHOR]