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!