"Foot Step Double" could refer to a technique, pattern, or movement that involves making two consecutive steps with one's feet. It's a term that might be used in various contexts, such as dance, music, sports, or even gaming. For example, in dance, it could refer to a specific step combination; in drumming, it could be a double stroke with the bass drum pedal; in sports, it might be a footwork technique.

Could you share a bit more context about where you've heard this term or how you plan to use it? That way, I can give you a more detailed and accurate description. 😊