In the
UK mooching means going for a
walk (usually looking for somewhere to eat) often while
drunk and/or stoned.
In the US mooching is one person taking advantage of another.
(Two guys drunk in a tent in England)
John: "Where's Dave gone?"
Jack: "He went mooching off in that direction a couple of minutes ago"
(Two guys talking about friend's
girlfriend in
America)
John: "Dave's just bought his
girlfriend a new car"
Jack: "She's just mooching off him coz he's rich"