humorous slang To depart or leave, especially at once or in a hurry. (A pun on "to split," a slang term meaning to leave or depart, and a "banana split," an ice-cream-based dessert featuring a banana halved lengthwise.) This carnival turned out to be really boring. Come on, let's make like a banana and split! A: "Where are Jeff and Sally?" B: "They needed to get home to feed the baby, so they made like a banana and split."