"flanking the gonk" is a sexual act where a woman is held upsidedown preforms oral sex on one man while another man stands on something and has anal sex with her while pouring hot wax on her feet.
man that chick was such a whore we were "flanking the gonk" all night long.
Verifying that another person'sgender is what they claim it to be. Generally refers to verifying that the female with whom you are about to participate in sexual activity does not have a penis.