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A hairy round piece of flesh just under your rump. Lots of celebrities are the victim of buttong flare which is one of the worst things that can be seen in public. Buttongs are usually exposed while wearing bikini bottoms. A good way to hide buttong flare is with tattoos in dark ink. Just remember to ask your friends if you have buttong flare whenever you are at the beach so that boys wont think your buttong to be unnatractive.
Dan: Dude! have you seen briteny's buttong lately?

Ashton: yeah its sooo round and disgusting!

Dan: yeah I know man
by Danny Zee April 15, 2011
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