A small, round ball of feces resident in the gusset of one's underwear. Unlike a traditional butt nugget, the Gusset Tuffet works itself free from the recess of one's ass crack but goes unnoticed until the undergarment is removed. Gusset Tuffets are long suspected of being the primary source of skid marks.
Roger took a nasty dump at the office. He thought he wiped clean but realized later he had been walking around with gusset Tuffets all day.
It was horrible, I've shed a stone since I took her knickers off and saw her filthy gusset, it was every kind of rank possible, i got a S.T.I just looking at it
Something gussied up has been made more attractive, but in a showy or gimmicky way, so it’s often not intended to be a compliment. It can also refer to dressing in one’s finery for some special occasion, when it is intended to be taken more straightforwardly. It is usually considered to be an American expression, dating from the late 1930s or thereabouts.