A person that sucks off the good will of others, to take advantage of people or persons.
Can u take me to the station, it 5 meters away but id rather 'Mooch' off you and drive.
One who it seems with no set purpose or goal, wanders about to their hearts content, usually with the secret aim of stumbling across a nearby pub.
"I'm gonna go for a mooch about."
"Okay, you Moocha."
"Who's that bloke? he looks lost."
"Oh, that's Moocha. Don't worry, he always looks like that."