A derogatory term used by people from the subcontinent (primarily India and Pakistan, but usage has also spread to some Middle Eastern peoples) to referred to white-skinned (caucasian) peoples.
This is considered an insulting or dismissive term, on par with the use of honky or cracker by African Americans. Often used when describing a caucasian in a position of power or authority, particularly over those that are Indo-Pakistani or brown-skinned. Also used to demonstrate ignorance or misunderstanding of Indo-Pakistani culture.
Undetermined origins, but evidence points to genesis among Pakistani-Americans in the midwest United States.
"Tommy is a good guy, but judging from the look of his friend Ed, he's nothing but a lousy hekma."
"A couple of hekmas came into the store the other day and spoke to me like I didn't understand English."
"Despite being smarter and more capable, I was passed over for the promotion to Sr. Software Engineer by my hekma boss in favor of another hekma...probably because of my accent"