A gusset in crocheting is the same as in other clothing/soft furnishings ie: a pair of Pantie Hose has a Gusset, it makes an area wider, usually in the same material as the rest of the garment/soft furnishing

To bust a gussset is to get so enraged that you split your clothes.

Gusset

sometimes when a woman is wet itll get pasty when it starts to dry and it sorta turns whitish/clear what the heck is a gusset?

A gusset is a clothing feature used to improve fit or for reinforcement of some type. It is triangular shaped. An example is that triangle that's sewn into the front of sweatshirts. That's a gusset used for reinforcement. You will find them in shoes, in the form of stretchy triangles on the instep of slipons

to improve the fit.