: In certain online communities, particularly those influenced by "vamp" aesthetic (often associated with Playboi Carti's fan base), a "solid post" might simply be praise for high-quality content or a well-curated "vibe".
For a look at the film that popularized the name, check out the official trailer: Vampfather
: If you're referring to a review or social media update about the film, people often discuss its "so bad it’s good" charm or Danny Trejo’s performance as an aristocratic vampire. : In certain online communities
Depending on where you saw the "solid post," it could refer to a few different things: Vampfather