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It's the same as der(see urban dictionary), but it is to be used in a more manner-oriented setting.

It's Der+Sir=a more respectful DER

You can use it at formal parties as well as with your friends if they've had a bad day, but they've said something stupid. You have to "der" them, but you don't want to break their spirits completely so therefore a simple "dersir" will suffice.
Dave was at the charity Gala and people kept telling him stupid things so he would respond to them with an abrupt, polite "dersir"
by Dermasterfriend April 02, 2009
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