aquasquatter
an occupant of a boat or other aquatic vessel who doesn't own, rent or otherwise have permission to use it.
"When I grow up, I want to be an aquasquatter. It's so much more posh than being an urban squatter."
aquasquatter
Residents of the Las Vegas area who collect hotel room card-keys from departing guests and use them to gain access to the hotel swimming pools.
He was an expert aquasquatter at most hotels in Vegas.