When you take too many drugs and your jaw uncontrollably starts chattering or clenching.
Ella: ‘Graham, your jaw is out of control, you’re clenching your teeth and they’re chattering too!’
Graham: ‘Yeah, I’m on a Gurney Journey’
a journey on a stretcher to the hospital after being incapacitated
a guy got pissed off at this dude in a bar so he sent him on a gurney journey straight past Pluto