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MCHAT is when you talk complete and utter bullshit for hours on end whilst high on MCAT aka Mephedrone. This is due to the effect of MCAT which makes people extremely talkative.
"That Mephedrone was lethal last night, I was talking MCHAT alllll night!"
by young-reezy February 05, 2010

Words related to MCHAT

drone mcat