Fugacity 

(Noun) A typical word your engineering professor will yell at you in the middle of lecture to flex how he is smarter than you but never explains what it is.

Student: "Dr. Peng, I was wondering how you solve this carnot cycle?"
Smartass Asian Professor: "Fugacity"
Student: "I don't understand what you mean"
Smartass Asian Professor: "I can't help you. Go work at McDonald's or quit school. This is highschool level problem."

Fugacity by deBallsBeSwagin' April 29, 2021

fugacity 

To act out of bad leadership;dickhead attitude.

Stop being such a fucking fugacity!

fugacity by Jim Bastow July 4, 2006

Fagacity 

When something, someone, or someplace is incredibly gay. Similar to the word capacity in that there is a point where something reaches it's maximum as there is a point where something is so gay that is has reached it's fagacity.

"Yo I had a dream that i was swimming in a pool full of Justin Biebers."
"Damn that pool has definitely reached it's fagacity."

Fagacity by moxzilla7 April 21, 2010