Clenching and unclenching your buttcheeks as if there was a Mars Bar jammed inbetween them. This is to ensure you keep the blood flowing when standing still for a long period of time.
Instructor: To keep the blood flowing don't forget to eat a Mars Bar. Don't fully eat a Mars Bar, and don't produce a Mars Bar.
by jentlemangack December 4, 2020
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"I was eating dirty and now I feel itchy!"
"OK. I'm going to test you for HIV."
"I was eating dirty and now I feel itchy!"
"OK. I'm going to test you for HIV."
by Hazel Street December 7, 2020
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