A fart that is released with the expectation of being a pure gaseous expulsion, but ends up unexpectedly moist and leaks a wet, sticky viscous into the ass crack and gusset of the underwear.
I was sitting at my desk and tried to squeeze one off without anyone noticing but ended up with a gravy scooter. Had to get to the shitter to wipe before it soaked through my new sansabelt slacks.

Hun did you eat at Taco Bell again? Why? Well your laundry has a pair of underwear that looks like there’s been a gravy scooter.

My new pantyhose were soaked from that coffee induced gravy scooter.
by Dick Onchin November 7, 2020
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