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1.
a state of perfect mind (the most uh-may-zing word ever) often given as a complement
man thats TANtastic, Dude thats TANtastic, wow! did you see how TANtastic that man was?! i hope you have a TANtastic day!
by Meli Jo! November 18, 2008
 
2.
referring to a perfect tan.
Ryan: woooah Tegan you are tantastic.
Tegan: but im pale.
Simone: nuh uhhh.
by Ryan, Tegan, Simone January 10, 2008