The food in the school cafeteria is yucky.
Would I go for somebody that the others consider is yucky, whatever you call it nowadays, yucky?
They also made very similar faces when they were shown some yucky photos: pictures of dog poop or dirty toilets.
A chelating agent that softens hard tap water by binding with dissolved metal ions, preventing them from being deposited as a yucky residue on your nice clean dishes.
Cut out snowflakes. Tape them up. Pour some eggnog in a cup. Oops! It's yucky on the floor. Llama Llama waits some more.