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1.
The word Imbatox was created with two words: IMBA and Krootox due to the amazing strength of Krootoxes in Dawn of War: Dark Crusade (v1.11 and below)

The word imba stands for "imbalance". It can be used to describe a in-game subject, such as a weapon or a specific gaming role that is overpowered or underpowered. Hunter in Ragnarok Online good example for IMBA.

Krootox is a creature of the Warhammer 40,000 universe; a krootox ground-dwelling herbivore which can be used as a combat weapon, usually by Kroot tribes.

The original inventor of this word remains unknown, possibly by a Dark Crusade player name Antipothis with the alias Mouse. (Confirmed by user Jaimas on Relic Forums)
Newbie 1, Newbie 2: "We don't know how to play Tau"
Intermidate: "Just spam imbatox to the enemy base while I attack"
by Your Neighbour December 17, 2006