by Ktgrb December 1, 2016

Really crazy, in a loopy, delusional sense. May derive from the sense of 'as crazy as someone who believes in aliens' i.e. to the extent of wearing tinfoil hats, or, less likely, someone who thinks as differently from a normal person as someone from another planet would.
by stellar760 October 8, 2013

by tbork2025@cfc.k12.wi.us December 15, 2020

Saying 'That's Crazy' can also be an phrase used for when someone is shocked, Amazed or Wowwed by something someone has done.
John - Hey Mike check out this aquarium I built.
Mike - You built that?? 'That's Crazy'
Or
*Television - And the Suspect now is fleeing from the police from North Bank.
*Person watching - Damn "That's Crazy"
Mike - You built that?? 'That's Crazy'
Or
*Television - And the Suspect now is fleeing from the police from North Bank.
*Person watching - Damn "That's Crazy"
by anonymous April 18, 2021

by ShadowUmbreon90 March 28, 2019

by MertiKey June 12, 2018
