adj. 1. a well executed task. 2. a job well done.
v. 1. to commit one's self to seeing a task through. 2. to perform a task thoroughly.
(original usage credited to Dr.Quirk)
Joss: "Whatever do you mean?"
Nickarossi: "Well, we've been half-assing this relationship for weeks now, when what we should be having is a full on, booth cheeks, whole-ass relationship!"
Joss: "So...you wanna have sex."
Nickarossi: "That's not what I said...but, okay!