unwarranted self-importance 

A serious form of narcissism. To act as if one is an important person without actually doing anything worthwhile to prove it, thus making one look like a complete tool.

Sometimes abbreviated as USI.

Idiot: Hey guys! I just put up all these sweet pictures of myself on Facebook, and I've got this vlog that you've gotta check out. If you don't, you're clearly some kind of lesser being, 'cause everyone loves me for no reason!

Smart Person: Sounds like unwarranted self-importance to me.

unwarranted self-importance by IrishBarbarian January 23, 2011

Impermanent 

Not permanent, passing, fleeting, not long lasting.

Fish-Demon: Wow, that was insane. I had to focus really hard while walking down that hill.
Fish: Don't worry, the effects are impermanent.

Impermanent by Lover of satan, a fish. April 16, 2011

Person of Importance 

A key person whose actions and opinions influence the events around them.

Ever since Megan's got the job, she's become a Person of Importance.

Person of Importance by the_surveiller May 16, 2013

impedance 

The bounciness of electricity, measured in ohms.

Nobody can define impedance so that anyone can understand.

impedance by Monkeyboy February 17, 2005

Self-importance 

An exaggerated sense of one’s own value or importance. -Emeasoba George

Self-Importance is synonymous with arrogance.

Self-importance by Emeasoba George June 9, 2018

atmospheric impedance 

Condescending geek speak for suggesting that your power cord is unplugged. Used to make people with social lives to feel as though they've been bested by a being whose diet consists primarily of Cheetos and Mountain Dew.

User: My computer won't turn on.

IT Guy: Perhaps it's a PEBKAC error, or your AC cable may be experiencing atmospheric impedance.

User: Atmos...? Ooooh! Heh, very clever. I'll have to share that one with my hot girlfriend.

IT Guy: I'm so lonely.

atmospheric impedance by phishtails April 29, 2010

impedance 

the state of being angry, narcissistic, and totally impedic.

he was stewing in his own IMPEDANCE

impedance by TotalImpedance October 14, 2019