If you had never seen the word abrelatas before, you might be able to figure out what it means by breaking it into two words: abre (it opens) and latas, cans. Un abrelatas, then, is a can opener. Spanish has dozens of compound words that are formed in the same way, and many of them are quite clever.
The lesson linked to above has most of my favorites, but here are a few more, just for fun: mondadientes, toothpick (it peels teeth); matambre, a type of South American meat dish (it kills hunger); matasuegras, a type of horn that may be blown at a celebration (it kills mothers-in-law); soplamocos, a strike to the nose (it blows mucus); and tirachinas, slingshot (it throws pebbles).
Do you have a favorite? Share it in the comments below.