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."
term used to show up those who call you a "smut muffin" thinking you're too blonde too figure out that its an insult. tums is simply smut backwards, and cupcake is just a way of mimicking the "smut muffin" phrase and one uping it by adding frosting. "tums cupcakes" are generally people too sheltered or stuck up to realize how obvious the insult is, and are usually the aggressor of the situation, calling their victims smut muffin freely not aware of the consequences.
ass: "youre just a smut muffin."
smartie: "I know thats an insult you tums cupcake. just because my hair is blonde doesnt mean im not smart enough to see through your dumb insults. read a dictionary."
ass: "why are we talking about tums? does your stomach hurt?"
smartie: "wouldnt you like to know."