An online person that is a childish, hateful, obscene, online, brute/brat. a choob is a person in the words of the leader of the ACM, the little kids online that have nothing better to do than cuss you out, challenge your gender, and talk about what they did with your mom last night.
Kirk: i beat you!!
Choob: i beat your mom last night, you @!@#!%^#@$#
Kirk: you are such a choob