The word "sappy" is an informal term often used to describe something that is overly sentimental, emotional, or corny. It can refer to things like movies, writing, or behavior that attempts to tug at your heartstrings in a way that feels excessive or insincere. For example, a romantic film filled with melodramatic scenes and clichéd love declarations could be described as sappy.
The word "sappy" originates from the word "sap," which refers to the fluid in trees and plants. The term began to take on a metaphorical meaning, suggesting that something is overly sweet or emotionally charged, thus resembling the excessive sweetness of sap.