A phrase used to convey confusion. Phrase usually said after someone says something to someone, and that other someone was not listening.
Teacher: The Mariana Trench is the large fissure in the Earth's surface located in the nether-regions of the "Oceanious Pacificus" which is the largest body of an aqueous saline solution.
You: Hummina hummina???
Friend: Hey, did you hear about that killer party Billy's throwing this Saturday?
You: (after coming back to the real world from staring off into space) Hummina hummina???
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