What does '67' mean? Dictionary.com's 2025 word of the year has no definition

"67," pronounced "six seven," spread from a rap song, through sports and social media, to classrooms and homes across the U.S ...
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Dictionary.com's 2025 word of the year, '67,' means nothing and everything at once

"67," pronounced "six seven," spread from a rap song, through sports and social media, to classrooms and homes across the U.S ...