One who has multiple personalities, specifically eight; many of which may contradict eachother, i.e. gangsta, skater, emo/punk, scene, jock, playa, prep, and/or rebel. Similar to, but not synonymous with multiple personalities or schizophrenia. People with this condition are known to change personalities often, rapidly, and without warning.
Person One: Wait, Sean is emo today? Yesterday he was acting gangsta.
Person Two: Oh, he's such an octoface.
The act of waving (like an octopus) one hand underneath your chin whilst making a weird face, and/or weird noise. The octoface is used in many situations, whether to just wave, or relieve tension. The octoface is very versatile.