I’ve found this terrific site that lists words from a number of languages that are totally unique and do not have an equivalent in any other language.
Some of my favourites from my perusing so far:
Katazu - Saliva held in one’s mouth during times of tension.
Bakku-shan - A girl who appears pretty from behind but not from the front.
Voetjies-hang - A toddler’s eagerness to ride in a car.
Snotklap - Lit. Snot Smack, to smack someone in the face so hard that snot comes out of their nose.
Paluego - A tiny bit of food that’s stuck between your teeth that you fish out with your tongue and eat afterwards.
Pagafantas - A guy who is trying to hook up with a girl, who ignores him, paying for her every whim.