BattleSoup is an internet video group from New Zealand. It is mainly led by Ben Kearney and Tom Neunzerling, and many of their friends have appeared in the films.
After growing tired of their old account, "Bengwin," they began the quest for a better name. One day Ben was playing a game online (Rainbow Six 3: Raven Shield), when he came up with the gamer name "BattleSoup". This was based on the simple fact, that Ben was a noob. He wanted a name that meant the same as Cannon Fodder, but more original.
Therefore BattleSoup means, quite literally, the Soup of Battle. So they made it their new production name. Almost immediately, they referred to Battle Soup as "BattleSoup" for conversations on Bebo or Windows Live.