Top definition
(n) The act of punching a person in the base of the arm on their birthday, depending on their age. (ex. punch a 16 year old in the arm 17 times, 16 for age, one for good luck.)

(v) Punching a person in their arm on their birthday according to their age.
John: Hey Brad, happy birthday!
Brad: Thanks John! Uh, what are you-
John: Birthday rocks!
** John punches Brad in the arm 22 times.
Brad: Agh! Hey! I'm 21!
John: 1 for good luck!
by richardtheIII April 05, 2011
Get the mug
Get a Birthday rocks mug for your dad Bob.