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2.
Beyond and better than Diesel. If someone's Fuel Cell towards you, they like you more than a friend.

See Girlfriend or Boyfriend.
Whoa, you're big pimpin', Enrique! Those girls are definitely being fuel cell towards you. If I used your tactics without practice, they'd turn gasoline in a matter of seconds!
by Java September 07, 2004
 
1.
A device which converts (most notably) hydrogen into electricity. They are extremely clean, quiet, and efficient, with the only emissions being heat and water vapor. They are MUCH better than internal combustion engines.
The Hydrogen Economy is the way of the future.
by Captain Dan March 04, 2005