Bumskin
A bumskin is a really dirty dumb low life person who doesn't care about anything other than having sex , drinking , and smoking.
Student 1: Dude did you hear about Kim and Brad ?
Student 2: No , What ?
Student 1: They were caught in the school bathroom smoking weed and having sex !
Student 2: WHAT ; that's crazy !
Student 1: But you know they're just bumskins anyway !
Student 2: True , true they don't care about anything. Plus they're super dirty , like who have sex in school bathrooms ?

Student 1: Haha , they are truly the definition of a bumskin dude !