Gender-inspecific indefinite pronoun, used for a person rather than a thing - differentiated from "it" because "tum" does not depersonify/dehumanize the subject. Used when the person's gender is either unknown or indeterminate.
I ran into the new tranny from accounting in the men's room - tum was washing tum's hands.
the term used when a personal innacurately calls another person a smut (slut). They are too naive to realize that "tums" is simply "smut" backwards. clearly those who use the word "smut" arent the brightest crayons in the box.
rude person: "You're such a smut."
awesome person: "oh yeah, well you're a tums."
rude person: "what does that mean?!"
awesome person: "if i weren't a 'smut' maybe i would tell you."