We found 3 dictionaries that define the word birthday sex:

General (1 matching dictionary)

1. Birthday Sex: Wikipedia, the Free Encyclopedia

Slang (2 matching dictionaries)

2. birthday sex, Birthday Sex: Urban Dictionary

Definitions from Wikipedia (Birthday Sex) ▸ noun:  "Birthday Sex" is the debut single by American singer Jeremih. ▸ Words similar to birthday sex ▸ Usage examples for birthday sex ▸ Idioms related to birthday sex ▸ Wikipedia articles (New!) ▸ Words that often appear near birthday sex ▸ Rhymes of birthday sex ▸ Invented words related to birthday sex