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A Ha Sil is when you yank someone's ear and yell 'Ha' while also grabbing their arm and screaming 'Sil' like you're trying to rip their shoulder off.
My cousin did a Ha Sil on me during breakfast and I spilled my cereal.
At the bus stop, my friend gave me a Ha Sil so hard I nearly fell over.
My teacher did a Ha Sil on me because I forgot my homework again.