The phrase "Let's Post It" seems to have become a rallying cry for fans of Addison Vodka and the "warehouse game." It's possible that a social media influencer or a group of users started using the hashtag to share their content related to the challenge. As more people joined in, the phrase gained traction, and the phenomenon grew.
The "game" aspect of Letspostit involves completing "dares" issued by anonymous accounts. These dares often involve geolocation tags, time stamps, and specific props.