The PolyDraw Tool

The Extrude Tool allows you to quickly create low-poly geometry, for example for blocking or retopology of high-poly objects.
It can be found in the Polygon Tools Menu (which is on the left controller on the right side of the touchpad (HTC Vive or Oculus Rift) when in Polygon mode.
The tool is indicated by Maya’s Quad-Draw Tool icon.

See this video for a demonstration on how to use the tool: