A smoothie was an Earth drink, made by blending food ingredients to a liquid consistency. Smoothies were sometimes made involving fruit and ice-water blended together.
This type of smoothie was listed by Tom Paris as one of the many things he loved about Earth's 20th century. (ST reference: Star Trek Cookbook)
In 2380, Christine Vale nursed an orange-banana smoothie in USS Titan's mess hall. (TTN novel: Orion's Hounds)