A sex act that can be completed solo or with a partner.
Solo: a man tucks his penis under his ballsack and ejaculates into his own butt crack while defecating, then squeezes his butt cheeks together mimicking a large pair of graham crackers.
With a partner: A man ejaculates into a partners butt crack while holding their butt cheeks together. The partner must be simultaneously defecating during the ejaculation to create a truesmore.
The act of jabbing your penis in a anal cavity and getting a nice load of chocolate on your rocket then nut on a graham cracker and place the crackers on either side of your meat, making a meat s'more. The your partner gives you a bj while eating the smore concoction.
I rented an RV to take my son camping. But it was raining and couldn't start a fire. So I said let's go into the RV and make some "city girl smores" using the microwave.