A "Dicktionary" is someone who corrects others on what words are actually supposed to mean. If a person uses a word incorrectly, the Dicktionary is there to not only define the word, but to also recreate your sentence with a better suited word.
Person #1: "I am profusely biting my nails!"
Person #2: "Profusely: 1. pouring forth liberally
2. exhibiting great abundance.
You should have said: You are ferociously biting your nails."
Person #1: "... Thanks, Dicktionary."