An exotic concoction of an imbecile and a fuckwit. Developed in the south east suburbs of Melbourne, Australia, imbafuck is commonly used to describe less intelligent specimens.
It is worth noting that and imbafuck’s stupidity is exponentially more prominent than a standard imbecile or standard fuckwit alone.
Imba is used mostly in online games or games that have patches or different versions. Imba means that something is imbalanced and should be "nerfed" or made worse. When something is imba it means that is is too good and it makes the game unfair.
Richard: I'm notsurprised you killed me Steasl Assasin is so imba.
Tod: Yeah they should nerf him in the next version he's to good.
Imba can be applied to a subject in gaming (Weapon, army, race, role or job) which can be either too strong (Overpowered, or OP) or too weak (Underpowered, or UP).
Although the word IMBA can be applied to both OP and UP, it is mostly used to describe an in-game subject which is too strong.
A good example for imba is the job hunter in Ragnarok Online.