Envy of your unborn descendants who will live in the future and have access to awesome future technology.
Person 1: Someday they'll invent chips you can have in your head that can access the internet.
Person 2: Oh man I want one.
Person 1: It won't be for a hundred years though.
Person 2: Aww, man! So those lousy future people will get to do it but not me? Lame!
Person 1: You have a case of grandchildren envy!
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).
Precedes or follows either a gratuitously disrespectful or honest remark, originated in New York City. Used in similar fashion to "no offense" or "to be honest," interchangeably.
Ya mans is wild buns, respectfully. Respectfully he's washed.
After school, The Modells on Jamaica Ave was active. Respectfully.