Another name used as a definer of character (See "Karen" or "Becky") Susan is a woman that is naive and/or clueless... She cannot typically understand sarcasm and she rarely "gets" the joke.
What do you mean you don't it?!?!? Ugh, you're such a Susan
1. A woman many paygrades above a Karen. Not only does she want to see the Manager, she wants to control what time the Manager takes a dump wile they're at work.
2. Control freak. Victim. Narcissistic cunt.
3. Someone who fingers their sister
"omg did you see how Susan acted out after the Manager told her she couldn't have a lollipop?! Gosh she must still be pissed her sister didn't return the favour after she fingered her"