1.) adjective - used to describe someone who is extremely muscular and/or strong. it is only used when "jacked" is simply not descriptive enough. this term is popular among anabolic steroid users, body builders, and athletes.
John: "man, I am so depressed, my ex won't stop harassing me"
James: "FUCK her bro! You're on fucking roids and looking jajajajacked as fuck!"