To have one's gak snatched, one would have had to have the goo that holds the brain in place, gak, taken, or snatched, from one's cranium, resulting in death; usually involved in black-on-white crime.
Yo bitch you best watch out! He gon' snatch yo' gak!
This is a strange term, to snatch a gak; strange, but wonderful!
when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.
This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.