Ice cream gets me dehydrated?

Dehydration does not cause genitalia discoloration. What you need is a doctor on that one ASAP ! ! ! As far as the dehydration, salt (which is an ice cream ingredient) can cause dehydration in large quantities. Was your ice cream salt free by any chance? Even if so, the salt in 4 cups of ice cream isn't enough to dehydrate you. Do you have a lot of sodium in your diet? Do you drink plenty of water & have a balanced diet? Did you have breakfast that morning? Not having a basic breakfast followed by rigorous activity can lead you to feeling faint & light headed.