Making something look better or neater, especially by cleaning or decorating it.
Spiffying makes things look nice and clean. It's like making something look new again.
Examples:
I am spiffying up my room.
She is spiffying her dress for the party.
They are spiffying the house for the guests.
We are spiffying the garden for the picnic.
He is spiffying the car to make it look like new.
Spiffying the room makes it look so nice!