Scottish janitor/groundskeeper of Springfield Elementary School, with with thick accent and bushy eyebrows. Famous for tearing his shirt exposing ripped, muscular torso. Lives in a shack on the school grounds, drives a tractor, often insults people he is gpeaking to.
Groundskeeper Willie: Have you got wax in your beester? I cannot fit into that wee vent, you croquet playing mint muncher.
Principal Skinner: Grease yourself up and get in there you... gruff speaking work slacker.
Groundskeeper Willie: Ooooh, good comeback.
Refers to the athlete Bo Jackson, used to describe someone who has all the potential in the world, and never meets that potential. Someone who blows it. May be an unfair association since Jackson did not blow his career (see Dwight Gooden) but was injured.