slang; generically used to signify an illicit substance that cannot be procured in any ordinary means by the general public. An essential prerequisite involves an uncharacteristically underground drug dealer who conceals him/herself in little conclaves on certain un-lit side roads, selling these aforementioned illicit substances.
Hey, I saw Swathi today outside UCL. She was smoking a bit that wacky backy!
EBK stands for "Elite Ball Knowledge." 1 In internet slang, "ball knowledge" originally referred to a deep understanding of football/soccer or basketball, but it has evolved into a broader term for having a highly sophisticated, deep, or niche understanding of any specific topic (such as music, movies, or subcultures).
Person A: "That scene was a direct homage to an unreleased 1982 Japanese indie film."
Person B: "Wow, EBK."