Cheese Bum is what happens on a hot day, or while working in a hot place when you develop Cheese in the Bum area. Can also be referred to as CB.
Man, those ovens running all morning give me cheese bum really bad!
by dabodeebodah November 14, 2010
The act of inserting cheese down the rear of ones pants, then waiting till the following morning. The resulting humiliating mess is known as cheesebum.
"How much cheese did we get down Petes bum last night? What a Cheesebum".
by cheesebum peter September 27, 2011

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