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1.
It's what the best man says to the bride and groom at a wedding when your nervous. Generally use could be to describe the happiness you are feeling for others.
ex 1: Dan and Sara, congradaboth you guys!

ex 2: So you guys spent 10 hours drinking beer?!?! Well congradaboth for not blowing chunks.
by theobese_sk8r July 19, 2010