Flashabugger Olive - Bugger. The Olive Flashabugger is an incredibly diverse fly that imitates a wide variety of trout food, these can include: dragonflies, damsels, leeches, etc. Leech Patterns have proven to be especially effective in the evenings. The early spring, and late fall are also times where the leech excels as the trout are skimming in the shallower waters. The Olive Flashabugger essentially just depict an edible treat.