What does it mean??

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Ok so I'm relatively new to this message board thing but I'm getting totally addicted. I've noticed a few things that I don't quite understand... I think I get the idea but would like to know exactly what they mean before I start using them :).

First of all - what the heck is bump?

Second - what is with calling someone "pants" or saying "pants" to them?

Thanks for the help!

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