The meaning of this line is open to interpretation, but some possible interpretations include:
* Sexual connotations: The phrase "dirty ice cream" could be seen as a euphemism for sex. This interpretation is supported by the fact that the song is about a woman who is being seduced by a man.
* Innocence lost: The phrase "dirty ice cream" could also be seen as a metaphor for the loss of innocence. This interpretation is supported by the fact that the song is about a young woman who is experiencing new and exciting things for the first time.
* A simple description: The phrase "dirty ice cream" could also simply be a way of describing the ice cream that the woman is eating. This interpretation is supported by the fact that the song is set in a hot summer day, and ice cream is a common treat in such weather.
Ultimately, the meaning of this line is up to the individual listener to decide.