i. To be "edgey" about something, i.e. To be aware of it.
ii. "Edgey" i.e. Watch out, something is about to happen.
iii. To keep an "edgey" is to keep a lookout.
i. "Edgey the free cheeseburger"
ii. "Edgey the swamp donkey coming your way"
iii. "Edgey Mr Mair, edgey the jannie".