MikeyB1980's definitions
Similar to a birthday, except instead of celebrating the day a man was born, he celebrates the day in which his penis reached its maximum girth.
Hey ladies!! Today is my girthday, and i was hoping you'd celebrate with me by letting me go deep inside! Whaddaya say?
by MikeyB1980 January 16, 2014
Get the Girthdaymug.