Laying Down The Vocabulary

I've seen a great word used a few times of late. This word: layabout. There are many words for the lazy. But a couch potato finds a specific place to laze. A bum is known for hopping train cars or fighting other bums for meals. One who is sluggish, torpid, listless, or lethargic probably has a thyroid condition. Someone who is apathetic probably took too many philosophy courses in college and developed ennui.
The layabout has no such excuse. The word implies a perfectly healthy person who will cast their keester down in any place and position that requires no work to maintain equilibrium. The next time you see somebody slacking off, determine for yourself if this is a run of the mill idler or shirker, or is this the pinnacle of laziness, the layabout?