Jules: You know what they call a Quarter Pounder with cheese in France?
Brett : No.
Jules : A Royale with cheese! You know why they call it that?
Brett : Because of the metric system?
Jules : Check out the big brain on Brett! You're a smart motherfucker. That's right. The metric system.
Brett : No.
Jules : A Royale with cheese! You know why they call it that?
Brett : Because of the metric system?
Jules : Check out the big brain on Brett! You're a smart motherfucker. That's right. The metric system.
by dlicen August 10, 2022

Extremely large brain. Usually named Lily.
Basically a person with a very large brain that has hella smart stuff.
Basically a person with a very large brain that has hella smart stuff.
by Edjn October 24, 2019

by cdmkv March 17, 2021

Big-brain, (Which can also be spelled without a hyphen,) means smart, intelligent, and is usually used when someone says something witty in an argument.
by ~Chrysanthemum~ December 2, 2020

Usually retarded people that thing their smart but their not. They usually have small brains and just say they have big brains to make themselves feel better.
by gamergurlbathwater420 November 18, 2019
