The Brief: Send it means do it or to turn oneself into a projectile.
Send it means to so something with confidence, and without overthinking it. Send it can be a skateboarding term meaning to do a trick. It can also refer to using any means necessary (a motorcycle, boat, ATV, skis, etc.) to turn oneself into a projectile.
The phrase “gonna send it” comes from a video in which Canadian stuntman Larry Enticer says “I’m still gonna send it” referring to landing a jump on a snowmobile.
“Send it up” as in the Kanye West song means to be aggressive, violent, or ready for a fight.