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"
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