a sound effect used when playing a trick on someone or stealing something.
similar to yoink
see also skanchskoach
someone goes to shake your hand and you fold your thumb into your palm and exclaim "skloop, dead fish".
your friend has hot fries from McDonalds, you smell the sweet aroma and steal a fry while saying "skloop"
your mother has a mug of hot coffee in her hand. You decide to slap it out of her hand. This would be a perfect time to say "skloop"