Sam is tall. This fact is noted by many other characters, not the least of whom is Dean. It is also much commented on by fandom.
Terms used to describe Sam's height include:
Crowley in particular has a number of nicknames based on Sam's height including:
- Jolly green
- Winchester jumbo size
In 7.09 How to Win Friends and Influence Monsters, the waiter Brandon refers to Sam as Big Bird.
Jared seems to be unable to escape quips about his height, having experienced running jokes about it in series like "Gilmore Girls"