When a woman (or person with female genitals and sex organs) consumes a delicious food item (such as a food item) and cums in her pants metaphorically. Most common at Mexican Restaurant establishments. Queso, as the titular item of this phenomenon, often bears a striking resemblance to the woman's metaphorical ejaculate in both hue and viscosity.
Oh me! Oh my! This margarita is inducing quite the queso explosion!