look up any word, like cunt:
 
1.
Uh...using poop as a masturbatory lubricant.
Steve walked in on his roommate and caught him mudjacking.
by IWhoAmNotHe October 07, 2009
 
2.
Someone jacking off using large portions of caked mud.
Did you see that hill billy in the woods yesterday? He was mud jacking like a mad man!
by Smoots July 02, 2011