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 by Dr. Clutterbuck April 4, 2011

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.

aquasquatter by beadman October 6, 2008

aquasquatting 

to occupy a boat or other aquatic vessel without owning, renting or otherwise having permission to use it.

Aquasquatting is so much more chic than urban squatting.

aquasquatting by Dr. Clutterbuck April 4, 2011