tooler noun4 •One who tools leather. •A stonemason's chisel. •A criminal who defrauds a fruit machine and steals the money inside. •(slang, no longer used) A pickpocket.Pickpockets took to housebreaking and housebreakers joined gangs of street thieves; cracksmen's mistresses were often toolers and shoplifters. — 1970 formstoolers