Fart trance 

To be caught in a mental state of un-knowing whilst constantly dropping farts

Brad wont be attending school today, as he iscsught in a fart trance

Fart trance by JC Conradical June 24, 2015

fart in a trance 

Someone who acts slow or drowsy, and generally seems disconnected from reality or 'out of it'.

Guy 1: You never listen to me properly.

Guy 2: ...

Guy 1: You're like a fart in a trance.

fart in a trance by Evezz January 21, 2009

Fart Traces 

Remaining traces of fart stench lingering in the air.

Dude It's been 10 minutes and I can still smell your nasty fart traces.

Fart Traces by Prosound November 21, 2012