Muck Butt - the dirty, slimy, stinky, sweaty, itchy feeling you get in your ass crack after going too long without bathing. Usually occurs after long backpacking trips, or in people with poor showering habits.
After backpacking for a week without bathing, Jason couldn't wait to get home and clean his muck butt.
by Scamtrack September 24, 2016

I'm getting a flabby chair butt from sitting at my office desk 9-5 everyday and not getting up all day long. Time for some exercise and a stand up desk.
by G_W_G September 11, 2013

by EasternKanye November 29, 2021

a hair-filled piece of ass lint
by Tango Golf July 7, 2008

by Thon November 25, 2007

by Bob Sachet May 1, 2006

by fatpat April 8, 2006
