 Friendly reminder, don't drive high. If you feel different, you drive different. Brought to you by NHTSA and the Ad Council. AdoptUSKids presents What to Expect When You're Expecting. A teenager learning the lingo. Jelly. Jelly adjective. Jelly is a shorter, better way to say jealous. As in, Chloe, I am like so jelly of your unicorn phone case.