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1.
adj. A person, event, object, or location that is considered extremely relaxed, pleasant, or otherwise non-taxing; exceedingly chill
Dude, let's go set up a hammock under those trees. It'll be chilltastic.
by TheTripod July 28, 2009
 
2.
chilling and having a fab time!!
lying in bed watching your fav programme 'chilltastic'
by san dee March 02, 2010