the "new trick" is a rollerblading trick that involves the use of the soul of the soul foot and the negative soul of the opposite foot.
It is performed by jumping on the rail/ledge and locking in with the soul of the skater's soul foot and simultaneously locking in on the same side of the rail with the skater's opposite foot by means of that foot's negative soul.
The "New Trick" is viewed as a difficult trick in the rollerblading community and is not a common trick indeed.
"Dude did he just do a New Trick? Sick!"