by awesomeaardvark March 15, 2009

While waiting for the next train, I was jotting down stuff in my notebook, such as a grocery list, song ideas, happy faces, and other mind graffiti.
by Mr Tango Jones January 10, 2010

Something someone wrote on a bathroom wall, contrary to your typical graffiti (which you’ll see if you drive through a ghetto) bathroom graffiti is typically done with a marker or a pen rather than spray paint. Very easy to find in a public school or a gas station.
Melissa: when I was in high school, someone wrote I was a slut on the bathroom wall.
Courtney: typical bathroom graffiti.
George: in the boy’s bathroom, it was mostly just random swear words and drawings of dicks.
Courtney: typical bathroom graffiti.
George: in the boy’s bathroom, it was mostly just random swear words and drawings of dicks.
by nutella137 July 17, 2020

by SMEAR July 31, 2006

by Mickey_M.... November 29, 2010

An artist’s lawbreaking pastime, whereby they irreverently paint math-related drawings, formulas, or symbols in forbidden areas or public squares without getting caught by the authorities—the artistic equivalent of a couple illicitly indulging in a quickie with zero public knowledge or suspicion.
Few illegal activities give the mathematical graffiti artist more thrill when working in a pressurized environment, compared to taking part in an annual pressure-free graffiti carnival approved by the authorities.
by MathPlus March 13, 2021

Any conglomeration of spit, skeet, urine, and scat(any bodily fluids and/or solids) in a public area.
Neal can look past the potleafs and the initials scribed into the stall door. But he could not pretend the toilet seat wasn't littered with biological graffiti.
by theAdKid February 06, 2009
