Reverse Grand Prix Attack
The “Reverse Grand Prix” is where Black plays the “Grand Prix Attack” setup in a Reverse Sicilian, which is a common “anti-Sicilian” used by White. The White system has the moves: e4, f4, Nc3, and d3 (along with other developing moves such as Nf3 and Be2 or Bc4. White castles kingside. Hence, the reverse Grand Prix attack has the moves: e5, f6, d6, and (usually) Nc6. It will typically arise in an anti-English or anti-Reti system.
Diagram: Reverse Grand Prix attack against the English
The black setup doesn’t have as much theory as the White version of the system. For more ideas on strategy, see also: Grand Prix Attack and Reverse Sicilian.