שאינו יודע לשאול

1) The dude who has no clue what’s flying and is the 3rd wheel in a group

2) a guy in yeshiva who doesn’t learn, doesn’t make money, and doesn’t chill hard, so basically has no life whatsoever and is completely wasting his time

Moshe: Hey Yaakov, are thinking about going to “x” yeshiva next year?

Yaakov: Nah bro! I heard it’s full of שאינו יודע לשאולs!