Top Definition
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
11 Words related to biological graffiti

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