Giving with the left hand

Mathew 6:3 "But when you give to the needy, do not let your left hand know what your right hand is doing"

Is giving with the left hand a bad thing?
If a person knows that he is going to give and then gives with the left hand is it bad? What is the meaning of this saying? It can't be literal, how about the left-handed? Or if a person by chance gives with the left hand? And also, planning and going out to give something, money or otherwise to the poor is a bad thing? Is this a bad thing? I don't want to seem to be a great giver but does planning on giving a bad thing?

Dave-W said:

It means do not make a big public deal out of your giving. It is to be done in private. Note the previous 2 verses:

1 Beware of practicing your righteousness before men to be noticed by them; otherwise you have no reward with your Father who is in heaven.
2 So when you give to the poor, do not sound a trumpet before you, as the hypocrites do in the synagogues and in the streets, so that they may be honored by men. Truly I say to you, they have their reward in full.

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I understand that. But a person cannot give in private in a public street filled with people how see us reaching for the wallet. It might mean to give and go our way.