A fart that usually warns you of an impending desire to take a fat sh*t that will definitely reduce your reputation with your toilet. It usually has a distinct and more powerful odor compared to the usual ones. It is far more potent, higher chance of leaving a lingering stench in the room depending on the size of the room.
Jack: ''Oh f*ck, I feel that I might need to take a sh*t soon.''
Gus: ''What makes you say tha- *smells the air* ew wtf dude?''
Jack: ''Sorry man, I let out a harbinger fart, that's how I know...''
Gus: ''What makes you say tha- *smells the air* ew wtf dude?''
Jack: ''Sorry man, I let out a harbinger fart, that's how I know...''
by TheMadShahaz July 15, 2023
Get the Harbinger Fartmug. Not doing what you're supposed to be doing ,goofing off
by jen39 February 11, 2024
Get the Fuk fartmug. 
A sound that may come out the the anus when Thai person has consumed food. It smells and might make someone faint because of the stench.
by Minecraft_Lover July 27, 2019
Get the Fartmug. A song made by ice spice where she tells a person “You think you the shit bitch? You not even the fart, (Grah) I be going hard (Grah) I breaking they hearts” Ice Spice is referring that the person is not the shit let alone the fart.
by Imamunch February 7, 2024
Get the You not even the fartmug. 
It's a mostly loud grimy sounding fart, typically slightly painful but oddly pleasant, defined as being sparky bc it's Extreme well could spark a metal chair coming out.
by Mcrghostmememer January 8, 2023
Get the sparky fartmug.