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A low-key way to saying you need to take a huge dump in mixed/polite company, such as at work or at your Grandmother's house.
"Have you seen Chris lately?" "Naa he'll be another 10 minutes, he had to Toast a Bagel. Poor guy had taco bell for lunch".

"Angela announced she would be Toasting a Bagel and would be off the phones for about 20 minutes."
by nickl140 July 27, 2012
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