Rear end, more specifically the skin of one’s behind. Significantly less offensive version the term asshole, appropriate insult in front of young children.
If I don’t take out the garbage, mom will tan my bumskin.

That bumskin just cut me off! *Honk honk*
by Perry and Walter December 9, 2018
Get the Bumskin mug.
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 !
by Kiiiiiii(: June 6, 2010
Get the Bumskin mug.
Bumskin
When in public toilets or communal showers of some description and all over the floor there is unknown bits of stuff you tried to avoid treading on.
Make sure you have your sliders on so you don't tread in that bumskin.
by Wastelander August 5, 2022
Get the Bumskin mug.