Ok))) this is so funny))))) i'm not sure whether i have to say or not! but since you asked...
http://www.freeduh.com/wp-content/up...erty_mouth.jpg
To summarise, if you trespass on this persons land they will tie you up and do sexual things to you!!!
A "purty mouth" is a refrence for a sexual act.(In an American movie from the 70's called Deliverance, there's a scene where a man looks at a boy and says he has a purty mouth. and then bla bla bla...) + ( "Purty" means "pretty" but said in a southern US accent)
Also Hog tied is, i presume, some form of restraint using rope or something similar.
I'm sorry that i had to say it all)