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1.
n. An annual celebration of one's bith. Usually celebrated with a bithday dinner or bithday party wtih friends or family. Traditionally, gifts are exchanged on your bithday. Usually, one's bithday falls on June 7. Thus, if one's bithday was June 7 and they turned 17 years old, the year of their bith would be 1994.
What's bithday? Did you know that its on the same day as my birthday?! Cool stuff!

Happy bithday, Rachel!
by agent michael scarn, fbi June 07, 2011