Cooning is a verb derived from the word coon. A coon was/is a person of african decent whose sole purpose was/is to entertain white people. These 'coons' started out as wearing black face, characterized by haveing big eyes and painting big red lips on their face. These people would tap dance, play instruments and sing.
Modern day coons are blacks who play stereotypical roles and black entertainers that promote ignorance.
Cooning is someone is acting like a 'coon'.
(a is singing and dancing in public with white people watching)
b: Will you come on and stop cooning!
a: Look at Wayne Brady, he's always coonin..
Someone who is looked at as leaving behind or neglecting their culture and assimilating to a white, western culture.
That exchange student has really been white washed