heinie

If you fling your grenade too soon a Heinie is liable to pick it up and throw it back at you before it goes off.

"Laugh ahead, Heinie," remarked Frank, though he knew the man could probably not understand him.

"Even a Heinie can see through a milestone when there's a hole in it," commented Billy, as he watched the enemy retreating.

Heinie Metzger ain't shrewd—he just thinks he is—and people have taken him at his own valuation.