My milkshake brings all the boys to the yard." The song "Milkshake" by Kelis came out in 2003 and peaked at #3 on the Billboard Hot 100 chart later that year.
As Kelis is singing about a woman who is irresistible to men, milkshake is clearly a metaphor or euphemism, though its exact meaning is ambiguous. People wondered what it could mean. Some speculate milkshake refers to oral sex, as Kelis also sings about how she could “teach you” about her superior milkshake. Others though milkshake signifies her breasts. Milkshake, after all, has been slang for “breasts” since the 1910s, crazy right?
Kelis herself has attempted to put a rest to the confusion as to what milkshake means. At first, when the song was initially released in 2003, she said that milkshake is something sensual that makes a woman stand out, even suggesting breasts or butt. In 2017, however, Kelis stated that milkshake as a metaphor “means lots of things.” As a metaphor, Kelis’s milkshake likens the special quality that makes a woman attractive like the dessert as a delicious treat. So, use it however you want ... as long as it's for sexual stuff of course.