For a long time smashing (in reference to grappling) was a dirty word, akin to the word footlock. With the advent of crosstraining by a handful of elite grapplers and the popularity of both Ribiero brothers and their protege Raphael Lovato Jr., smashing has become an acceptable way of conducting yourself on the mat. The idea behind the smash is pretty self explainitory, and you might even be able to draw a connection to BJJ's cousin, wrestling. Many would say that wrestling's speciality is controlling, grinding, and finishing. If you add that mentality and structure to your BJJ game, you wind up with techniques similar to what BJJ Blackbelt Liam Resnekov of VT1 Gym Sydney will show us.
Whether this is your grappling style, or if mount is all you care about, this pass is right up your alley. It's also a great technique to use for competition and it will quickly throw 7 points up on the board for you.