Vomiting; throwing up; hurling; puking etc. etc.
More specifically: Throwing up in someone's car.
Background: After eating McDonald's, Cliff threw up all over Max's car, therefore throwing up in someone's car became "cliffing" and then it became a general term for vomiting.
After eating some suspect curry and smoking too much pot, Zak ended up cliffing all over the back of our van.
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