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1.
A person who utilizes libertarian rhetoric or associations to disguise support of government agendas.

Most often lives or operates inside the Washington D.C. political arena, located within the borders of Interstate 495, aka the "Capital Beltway".
That beltarian is at it again: claiming we need to shrink government while advocating for tax increases and more war spending.
by zwordsmith December 18, 2012
 
2.
A Prize idiot - see also Mitchellism. A derivation of the term 'Belter' applied to anybody with extreme knowledge of the inane and pointless. Somebody who is prone to making remarks relating to the above.
"You're a Beltarian of the highest order!" - Skeletor.
by Beltarian_no1 March 25, 2009