When you tapalos something, you hit it lightly with your hand or finger.
Tapalos is usually gentle and not very loud.
Examples:
She tapalos the table to get my attention.
He tapalos the door to see if it's locked.
I tapalos the drum and it makes a soft sound.
The cat tapalos the ball with its paw.
He tapalos the window and it breaks! Just kidding, it doesn't break.
I tapalos the book to see if it's real.