To scatter things around in a messy way.
Strowing things is usually not good because it makes a mess.
Examples:
She strows her toys all over the room.
The wind strows the leaves in the yard.
He strows the papers on the floor.
The naughty dog strows the trash around the kitchen.
The magician strows glitter all over the stage.
The little girl strows her crayons everywhere.