I think you may be referring to the combination of red wine and purple grape juice. "Red bottom" could refer to red wine, as it typically has a red color, and "sipping" would imply the act of slowly and delicately drinking. Combining red wine and purple grape juice could create a rich and fruity beverage. Keep in mind that this is just my interpretation based on the given words, and there may be other meanings or associations to "red bottom sipping purple" that I am not aware of.
