to get ready to smoke marijuanna or gear/ smoking before attending a social function.
dude, the bbq is going to be lame.
fuck that, i'm gonna gear up for it.
To step up to the challenge, get motivated, work harder to get the job done. Man up. Entice. Motivational statement.
person 1 - "i'm really struggling to all this done in time..."
person 2 - "you're gonna have to gear up mate."