worksucks.jpgMcJack@ss (mic ‘ jak ‘ @ss) - 1. A employee of the fast food chain McDonalds who engages in clown-like activity (i.e. Terry “lettuce hands” Simpson - pictured to the left). 2. A customer who thought the McRib was good. 3. A parent who encourages their child to play in the McDonalds play area without first allowing their food to settle. The end result of this type of activity is vomit and or an unappreciated odor.