john snow 

He knows nothing.

Person 1: "John Snow"
Person 2: "you know nothing John Snow"

john snow by Miss_Say_it June 18, 2015

John Snow 

No not a fucking game of thrones character. He is one of the greatest English doctors. Look him up, he contributed to the study of chloroform and Cholera. (The Broad Street Pump epidemic.) He was against the idea of miasma.

John Snow had suffered great insults from the board due to his contributions against Miasma

John Snow by sachadergrosse October 29, 2019

John Snow 

Did you mean: Aegon Targaryen

Person 1: John Snow king in the north
Bran: Did you mean Aegon Targaryen

John Snow by StefanDB September 7, 2017

john snow 

A person who literally knows nothing.

-- WTF, don't you even know who is elected last night?
-- Wait, what? I guess I am just being john snow again.

john snow by donaldrump November 15, 2016

John Snow 

An old man’s white pubic hair that is overgrown with his penis barely poking out.

The dressing room door was open and I saw that man’s John Snow.

John Snow by ForrestBeau June 22, 2024

you know nothing john snow

this phrase was derived from tv serial game of thrones , addressed to john snow by two female characters of the serial in a state in which john acted reasonably.
A person who misses a bang bang opportunity acting like a wise ass.
A smart ass treating like a guy from 70's

having refused my girlfriend's tempting request for spending the night in bed with her, she just said you know nothing john snow.

you know nothing john snow by yousef cool April 16, 2015

The John Snow 

Right before you bust a nut you scream "Winter is coming"

"Last night I me and my girlfriend were going at it and I did the John snow"

The John Snow by Long dong danny July 14, 2018