1. To play a popular video game with a friend in platonic fashion.

Usage note: Nescient individuals often refer to this activity erroneously as "playing Halo".
"You want to Kill Aliens later on?" "Yeah, but if we're fighting the Flood, you'd better let me pick up the first shotgun this time."

"Are you guys playing Halo later on?" "No, we're Killing Aliens."
by Timothy West May 16, 2008
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