Phrase used by insecure xenophobes as a response to someone with different hobbies, interests or attitudes to themselves. These people often think they have a lot of friends, but usually nobody really cares for them.
"You are intelligent, have a high-paid job and a good future? Get a life!"
"You don't like the same things as me? Get a life!"
Originally, a patriot was someone who loves their country and supports it, but won't blindly follow whatever their country's government does. These days, it is synonymous with Nationalist, which is someone who blindly follows whatever his country's government does, and lacks his own ability to think and reason for himself.
Many Americans seem to be patriots. More of them are nationalists.
A small, transparent and non-soundproof dome fixed on top of the Planet Express building in Futurama. Only ever seen in one scene in one episode, Professor Fansworth (supposedly) often goes in there to let off some steam. A truly pointless invention.