a way to describe you that your ass is on the highest level of badness. or to describe a person or thing at the strongest level.
nick: i heard you bought yourself a new auto.
jim: yeah, it's a ford escape hybrid suv with four wheel drive.
nick: too bad it isn't TRAIL RATED like my Jeep.
jim: (starts to cry)
sally: what are you doing?
tina: i'm stealing your dog.
sally: you can't do that.
tina: bitch, i'm TRAIL RATED. i do what i want.