The phrase "gigantic bosses" refers to large or huge people in positions of authority or power in a workplace or organization. They are the leaders or managers who oversee and supervise others. Full definition
With interesting gameplay mechanics like the Force transforming enemies into bombs, direct Light Saber control announced for the Wii (along with an exclusive wii - saber duel mode), and an emphasis on gigantic boss battles, this should be any convention goers dream. (thatvideogameblog.com)
Craft gun monstrosities that no reasonable person could ever lift, play together with your friends, fight gigantic bosses and experience randomized mayhem as you battle your way to the heart of the fleet to destroy the MOTHERGUNSHIP! (indiemegabooth.com)
Along the way players must defeat gigantic boss colonies the pathogen has evolved with the sole purpose of stopping the Nano Probe from completing its mission. (metacritic.com)