A boss character in Undertale that is skeleton and likes to give you a bad time if you killed everyone. The only way to fight him is to be a major dick and kill everyone. Its the only way to level up as well. Sans is generally a pain to fight and one of the hardest enemies in Undertale.
by TexasRed May 24, 2019
Get the Sansmug. A punny skeleton who loves puns and his brother. He can be your best friend or your worst enemy depending on the run you choose. He is named after the Comic sans font which is a pun itself. He thinks he’s funny and a synonym for funny is comical. He is very mysterious and there is a deeper story to sans and all the theories are very interesting but no one knows for sure the actual back story except Toby Fox himself.
by 05_undertale February 13, 2019
Get the sansmug. A mainstream internet icon. Originally from the hit indie game Undertale and getting a cameo in Deltarune a few years later, Sans is a lazy, pun-loving magical skeleton of unknown origin. He is also fat (how? Don't ask me idk either) and loves ketchup??? Also he grew a reputation of getting a insane amount of fangirls over the years (especially in 2017-2018). If you mess with his brother Papyrus, you will have a bad time.
by Lien Drawing March 16, 2022
Get the Sansmug. 
I'm Sans...sans the skeleton.
by lionheart617 September 4, 2016
Get the sansmug. Japanese equivalent of Mr/Mrs/Ms. Most often used with a person's surname, less commonly used with a person's given name. This is used for someone you do not know very well, like a classmate who isn't your friend and isn't in a higher grade, or a co-worker who isn't higher status than you.
by Bean-chan July 8, 2006
Get the -sanmug. Sans : It's a beautiful day outside, birds are singing flowers are blooming. On days like this kids like you....
SHOULD BE BURNING IN HELL
SHOULD BE BURNING IN HELL
by Infochan July 10, 2016
Get the Sansmug.