1. Reverse of a hard-on
2. When the sight of a disgustingly ugly piece of ass makes your dick want to curl back inwards in fear of its master whipping it out and taking it near that disgusting, ugly vajayjay.
Dude, I dunno how he gets with her, she gives me a REVERECTION.
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."