What does the song milkshake by kelis mean?

Kelis' milkshake means exactly this: Sir Francis Drake, Vice Admiral (c. 1540 - 27 January 1595), was an English privateer, navigator, slaver, and politician of the Elizabethan era. Queen Elizabeth I awarded Drake a knighthood in 1581. He was second-in-command of the English fleet against the Spanish Armada in 1588, subordinate only to Charles Howard and the Queen herself. He died of dysentery after unsuccessfully attacking San Juan, Puerto Rico in 1595. His exploits were legendary, making him a hero to the English but a simple pirate to the Spaniards. To the Spanish he was known as El Draque, "the Dragon";[citation needed] "Draque" is the Spanish pronunciation of "Drake". His name in Latin was Franciscvs Draco. King Philip II was claimed to have offered a reward of 20,000 ducats (about £4m or $8m by modern standards) for his life. He is famous for (among other things) sailing around the world, returning to England in 1580.