a jumping bean is a person of non-latino heritage who assumes a latino accent when saying words in spanish. I have to clarify that one can say the proper word without assuming the accent.
I saw mr. hernandez (pronounced "Hairnondayz" with thick, sent-up latino accent) on the street today.
People who unexpectedly jump into a Spanish accent mid-sentence when pronouncing the word "Latino," only to finish their statement in accent-free English.
Though Jumping Beans were at one time Latino newscasters exclusively, people of any race or occupation can now be Jumping Beans.