The pairing of Axel and Roxas in the game Kingdom Hearts II. This also may be reffered to as "the best thing since Soriku" or "F-ing HAWT." or "Dear God, did you just see that strange man with red hair set himself on fire???" Most people/cosplayers/fangirls of the pair will know that the "couple name" comes from the combination of AKUseru and ROKUsasu.
The two were once part of Organization XIII, but were mercilessly killed and/or converged with the original Keyblade master, Sora.
Also, this term is directly related to butt-smex. XDDD
Axel: He made me feel...like I had a heart.
Roxas: No one would miss me. *fangirl teardrop*
Axel: You can't go against the Organization!!! >_<
Axel: Gimme, gimme, gimme a man of the midnight! Won't somebody help me chase the shadows awaaaaaaaaaaaay~!
Roxas: Wtf is AkuRoku...? *types in on Google* JESUS CHRIST!!!!!