The phrase comes from fantasy role playing and strategy games, where mana is the resource spent to cast spells and the game blocks the action when the pool is empty. Short spoken warnings like this became familiar through years of repeated gameplay, similar to an error sound that tells the player no without opening a menu. Clips of the line spread through streams, edits and soundboards as a shorthand for any shortage, from an empty wallet to low phone battery, keeping the original gaming meaning easy to recognise.