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To Sand-Chimp out is when a middle eastern or Pakistani person (usually Muslim), removes his/her façade as a civilized human being and releases his/her Inner Sand Chimp; as in to start shouting about Allah, The Quran, "death to America!!", throwing shoes around and blowing themselves up, Basically to burn flags, behead people and marry a 12 year olds.
I was trying to talk about the war with that Middle eastern guy, but all of a sudden he sand chimp out on me and started screeching allah, threw a shoe at me shouting "Allāhu Akbar!".

"Hey turn on the news channel there is a some camel jockeys sand chimping out!"
by BudBudDingDing2.99 September 22, 2011
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