Heathrow Airport Share definition Flag 1) The busiest airport in the world. 2) A place to go during a heatwave if you want to pass out. 1) "Dude, we're going to Heathrow!" 2) "Dude, I wanna die." "Dude, let's go to Heathrow." Heathrow Airport by Soiled Undergarment August 11, 2003 0 0 Get merch Get the Heathrow Airport mug. Buy Now — $32.95 See more merch