A steaming and unusually large load of waz blown directly into the hair on the back of the recipient's head.... right after a good old fashioned anal pounding. (The kind that mom would be proud of. ) Recipient must be fairly skanky with a mild to full blown case of monkey butt.
Bill took that nasty bitch Jill home from the bar last night. He couldn't stand the sight of her face and her teeth looked like she made a career of eating gravel... so, he gave it to her real dirty in the dumper. As he was nearly finished, he thought, "What the hell, why not? " so, he pulled out and gave her a hot mud honey treatment.
:1) To be having such a shitty day that you feel like you're wearing a Five Pound Mud Hat. 2) To be on the receiving end of a tubgirl. 3) To have your head so far up your ass that you're wearing a Five Pound Mud Hat.
And she was all, "you want me to give you a Five Pound Mud Hat?" And I was like, "wtf's a Five Pound Mud Hat?" And then she said, "why don't you look it up on urbandictionary.com ass hole."