If something is scrappy, it is messy or not well organized. Also, a scrappy person is someone who likes to fight or argue a lot.
Being scrappy can be seen as a little bit tough or determined, but it can also be seen as not very nice.
Examples:
The yard was scrappy with toys all over.
She's a scrappy fighter, always ready for a challenge.
The scrappy dog made a mess in the kitchen.
I don't want to play with your scrappy toys!
The scrappy cat always wants to fight other cats.
He's a scrappy player, never giving up even when he's losing.