When you are slamming a glorious piece of tail and she asks you to choke her (which seems to be trending a lot lately) and you do it until she turns blue.
Papa Smurf is when you can only finish by smurfing... and then you have to make sure you finish on her chin giving her a white beard aka. Papa Smurf.
"I can only finish if I Papa Smurf some fine ass piece of va-j."
"So i was smurfing this delicate little bird and she loved it like Magic Johnson loved dudes"
"Hey bro, what are you doing tonight" - answer "I am going to smurf my booty call within an inch of her life"
"Smurfing isn't a sexual act it is a lifestyle"