a screechy terrifying young girl who scares the living shit out of me
also a lil' bitch who will kill if you even mention sans not being real
Me: did you see that sans fangirl
Sans Fangirl: WAT U SAY ABOUT ME
by Whyjust...why June 24, 2017
Someone who really likes sans undertale likes them so much they start to fangirl over them, pretending that they are sans' wife, even though sans is a fictional character. If you try to talk some sense into them, they'll just keep coming at you with shitty videos of their oc killing you.
Fangirl: OMGG!!!!, I THINK SANS IS SOO CUUTEE!!!!!!
Sensible human being: you know sans isn't real?
Fangirl: BUT I WANT HIM AS MY HUSBAND!!!!! I'M HIS WIFE NOW
S.H.B.: But he's a fictional character.
Fangirl: FRICK YOU!!!! I'M GONNA MAKE A KILLING VIDEO ON YOU!!!!
S.H.B.: you're just another sans fangirl.
by rshiba April 18, 2019
A sad little girl hoping to find love in a fictional video game character from undertale. a prime example is casey sans wife a little screechy bitch who cries over discord and says shes gonna kill herself. they also tend to like shane dawson and BTS that gay nigga boyband. this is what a sans fangirl is
Things a sans fangirl might say:
"IF YOU TRY TO HURT ME SANS AND I WILL KILL YOU"
"im sans wife and gf"
"im gonna make a killing video"
"SHUT THE F UP SANS IS AWSOME"
by LocalFresh March 29, 2019
one of the worst breed of fans ever. it's this cringy fan of sans who kills over the internet if you try and touch him.
bill: hey, have you seen that fangirl of sans-

zack: DON'T YOU DARE SAY IT-

sans fangirl: DID SOMEBODY SAY SANS?
by rick animation March 6, 2022
Mainly edgy as fuck has sex with sans on camera all of them look like trash they always uses sans’ quote from the genocide run in undertale “your gonna have a bad time” all have animal ears and tails or they just have over exaggerated curves make horrible animation memes say they are sans’ wife and girlfriend (why do you say that you can’t be two things at once) ALWAYS have alternate versions of themselves make killing videos and they all hate cringe compilations even though they are in most of them don’t know grammar (that’s it)
It’s hard to find sans fangirls that don’t fit this definition
by Starrysanswhohas_met_every_one December 8, 2019
A fucked up person who makes cringe about her oc and sans

A person who will murder you if you touch her sans even know you cannot kill people on the Internet
by Phoenix the trash weeb February 19, 2021
A girl who is a BIG fan of Sans and loves him and often thinks dirty about him. They will ship Sans with Frisk just to imagine theirself with him. Like me sometimes,
My friend Stacy is s total Sans Fangirl. “
by ShinyUmbreon6577 April 18, 2020