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1.
When you send someone (who is in jail) a cake with a file in it
Pedro got busted for mastubating in public and was put in jail. So his best friend John sent him a Mexican Birthday Cake
by Pedro_Salty_Ballz August 08, 2009
 
2.
The act of eating several helpings of beans and deficating them on somebodys person.
I gave Sherry a mexican birthday cake and she was delighted to receive it.
by scott negley March 21, 2007