A group of thrifters (money lenders) who are given loans at a fixed 3% rate, dole out loans with a 6% interest rate, and arrive for golf at three in the afternoon--hence 3-6-3.
First mentioned in Michael Lewis' Liar's Poker book, a typical 3-6-3er was a balding, middle-aged man who thought nothing only of money.

"Man, those guys from the 3-6-3 club are buying our junk bonds."
"Yeah, not too smart, eh?"
by Macphisto June 12, 2006
Get the 3-6-3 club mug.
A way to respond to somebody being really unhelpful (Similar to saying "No shit").
Person 1: In case you were wondering, you can craft a torch in minecraft by putting coal and a stick under it...
Person 2: Oh rly? Well BTW 3+3 = 6.
by Retard_Ryan February 9, 2023
Get the 3+3 = 6 mug.