When a male and female proceed to have sexual intercourse, and while doing the dirty, the man realizes the girl is on her period, and her blood has rubbed all over his penile unit. In complete disgust, the male vomits all over his own penis, and the puke mixes with the blood, therefore creating a mixture that looks like chili on top of his dog (penis).
Charles: Wait whats that smell?
Virginia: Oh, well i forgot to tell you im on my period!
Charles: Oh no, your gona make me create a chili dog!