Taken from the 80's TV show "Pob" where the title character blew spit over the TV screen and wrote his name in it. Although in this version when shagging doggy-style, just as you are about to ejaculate, you pull out and come on your partner's back. Then, write your name in spunk on their partner's back.
Andrew was pounding Karen hard from behind, just as he felt he was ready to climax he pulled out and spunked on her back pobbing her as he did.
Hooking up with a co-worker of the same sex while still on the clock. Works out best if you work in a concession stand that sells Mr. Pibb. Then you can ask other employees to Pibb you when they ask if you want something to drink.
Cayte: Would you like something to drink, Heather?
Heather: Pibb me.
*Then pibbing would ensue in front of customers or behind closed doors, but it must be on the clock if it happens at your place of employment. Pibbing can happen at dorms as well, but its not fun unless you're watching Wayne's World at the time*