When you strew something, you scatter it all over the place. At a wedding, for example, the flower child's job is to strew the path with petals.
One of the scariest parts of "The Wizard of Oz" is when the winged monkeys pounce on the Scarecrow and strew his insides all over the forest floor. It's a tricky word, because it sounds the same in the present as it does in the past. The monkeys strew the straw then and might strew it now: in any case, the straw will be strewn all over. After the clambake, the beach was strewn with empty shells and beer bottles. After strewing all that stuff, they forgot to clean up.
