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1.
Musey = Rather brilliant, relaying to the live performance of Muse at Glastonbury, especially of the song Stockholm Syndrome
This website is Musey!
by Gilaventi September 27, 2004
 
2.
Someone who is very open to government conspiracies and will often challenge every single political point you say with "It's all a lie. When the Zetas fill the skies..."

Also if they like the band Muse, although not necessary.
Look, I don't care if the government is lying to us, stop being so Musey!
by Matt_Bellamy July 04, 2009