When you dip your dick in a liquid then drag your dick across the face of a sleeping victim. This simulates a tongue licking your face. This can also be when you beat someone up using your dick and giving them a lickin'.
Victim: "i had a weird dream were a dog was licking my face"
prankster: "nah, i gave you a head lick"
Head jog: Trying to run through your past memories to retrieve a certain event or a sudden past memory clearly and suddenly coming to the forefront of your mind, usually as a result of an associated person/item.
I bumped into an old school friend, it was a real head jog. It bought back so many great memories I'd almost forgotten about!