A peepalo is a creepy individual who "peeps" or pries into other people's business without them knowing. After "peeping" into other people's affairs, they "peep" back out into their own cave.
AKA: A harmless/creepy stalker
1-When "S" was sleeping over "K"'s house, she kindly requested that the door of "K"'s room to be locked because she was deathly afraid of peepalos creeping into "K"'s room.
2- When "E" and her friends were eating pizza at a restaurant, she kept "peeping" at the delivery boy. She was being such a "Peepalo".