What's a "bump"???

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Hi, I'm new and loving MFP! I love the encouragement and motivation updating the site gives me each day. I left my marriage last year, and have not been active or healthy since. Now it's time. I want to look good, but most importantly... feel good.

But... what's a bump?

I see everyone using it on here, and I don't know what it means...
:cry:

Please help me join Bump-nation!!!

So I can be :happy:

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