look up any word, like kappa:
 
1.
An adjective for someone who is really witty and funny when texting, but rather unamusing IRL.
Man, that Ann is chatastic on line, but in person...meh
by drdave56 April 11, 2014
 
2.
way to describe something as being great
dude my day was chatastic
by hank bottombelly June 12, 2009