The act of receiving oral sex; Commonly known as brain, as in "getting brain," heenan is derived from WWF superstar manager Bobby "The Brain" Heenan. To get heenan is to receive oral sex. Therefore, when someone is receiving brain they are receiving heenan. Also known as head, dome, and skull.
This fine cutie pie gave me the illest heenan last night. I think I'm in love.