A bullhonkey cover is a RidewithGPS privacy zone cover used by CDOT road bicycles to mask activity recorded on Mountain biking trails.
Sophie: Oh sh!t why am I on the C-470 trail instead of C-470? Stupid group ride! I guess I will use a bullhonkey cover to mask that embarassment up and stick to the shoulder from this fucking moment till the moment I die.
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."