Etymology: Originated from a MMORPG player with nickname nexu. He is notorious for being afk(Away From Keyboard) during raid or important group activities at the most important times.(ie. Boss pull). Slowly his name evolves into a verb, meaning Away From Keyboard.
Definition: See AFK(Away From Keyboard)
"Hey, just a second guys, I'm gonna nexu for a bit, gotta piss."
"Did he just pull a nexu on us?"