phrase, started as an attempt to say "put your drinking hat on" and "pull yourself together" at the same time and came out as "pull your shorts on". Means - get yourself together, lets go, its party time, stop being crabby, get out of bed,....or anything else needing a pep talk.
noun, taken from The Nightmare Before Christmas. Can be used in various ways, but is most commonly used in reference to a girl that goes big and is hungover the next day...or just an interchangeable word for friend or whatever else you desire. Synonym to gnar star.