the sexual act of inserting a hot dog weiner into your partner's anus and proceeding to eat it.
A Fun Charlie may also be performed with assorted toppings, such as, but not limited to:
ketchup, mustard, mayonnaise, hot sauce, or relish.
when the hot dog is inserted into a vagina, it is referred to as a "Fun Amy"
Bob performed a Fun Charlie by inserting a hot dog weiner into his girlfriend's butthole, adding some relish and steak sauce, and then gladly devouring the weiner.
the sexual act of sticking a hot dog in your partner's anus and eating said weiner
person 1: hey did u give your gf a fun charlie?
person 2: hell yeah i ate that thing right out of her pooper!
person 1: yo dawg thats kinky AF'