When you're just too damn ignorant to completely say "turn up" and you instead decide to not complete the full term of "turn up". It has the same meaning as "turn up" or "turnt".
John: "Hey, Ben! What are you doing tonight?"
Ben: "Turnah! Turnah! Turnah!"
John: "Wow, you're ignorant."
Ben: "Turnah! Turnah! Turnah!"
John: "Wow, you're ignorant."
by nickington December 10, 2013
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