The powdery residue at the bottom of a cereal bag. It's flakey and dusty.
The only thing that can ruin my cereal is the flust.
by Sstephen August 15, 2015
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Somewhere between crust and fluff. Perhaps something nasty in your belly button.
I think I have a problem! I stuck my finger in my belly button and pulled out some flust.
by Toshibi January 03, 2006
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When someone is extremely angry or upset.
LOL dude I had sex with Eli's mom today.. He is SO Pussy Flust!
by Pibbz January 02, 2014
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