Base drop
The term "base drop" originated from dubstep music. Over the years, dubstep has had an increasingly large part in outdoor films, especially skiing, snowboarding, and mountain biking. Often times when a dubstep song is used in one a ski or bike film, a "base drop" is used to emphasize a trick. The term "base drop" is now being used widely to describe a trick done on skies, bikes, or snowboards.
Dude 1: Check out this rad base drop I'm gonna pull!
Dude 2: That was gnarly brah!
Dude 2: That was gnarly brah!