When you take a huge hit off of a joint, blunt, bong, bowl, etc. to the point where you cough uncontrollably. You can feel a goncho hit when when smoking out of a bong as the back of your throat starts burning before you pull the slide.
"Dude, just take a goncho rip off of that and pass it back"
"Hey Tyler, you wanna get gonchoed before the steelers game?"
"Hey Tyler, you wanna get gonchoed before the steelers game?"
by The Notorious D.A.N. January 23, 2009