[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.