smerious 

Even more serious than just plain "serious."

Guy: Are you serious?
Girl: I'm not just serious, I'm smerious.

smerious by TheMan232 July 15, 2010

Serious as a beaver 

Utmost seriousness. Unequivocal state of demanding careful consideration or application.

Person 1: "Are you serious? Are we really going to this party?"

Person 2: "Yes. I'm as serious as a beaver"

Person 1: "Ok, sorry. I'll get my things"

Serious as a beaver by eduardo_saverin January 25, 2013

Serious drooling 

Much desire, lust or admiration is shown.

We are looking over the car show and the gentleman's club, so we got some serious drooling to do!

Serious drooling by I, Wreckerrr November 12, 2016

smearious 

A combination of the words "smart" and "serious" usually used in a sarcastic form. Originates from the sentences "are you serious?" or "are you smart?" indicating that the answer to the subject is obvious.

Sally- "I locked my keys in my car! And I'm getting worried because it's starting to rain and the top is down!"
John- "Are you smearious?"

smearious by IKilledJP July 26, 2010

some serious honkers. a real set of badonkers. packin some dobonhonkeros. massive doboonkabhankoloos. big ol' tonhongerekoogers.

boobs i think probably

Tw(blackness):i got this new anime plot. basically there's this high school except she's got huge boobs. i mean some serious honkers. a real set of badonkers. packin some dobonhonkeros. massive doboonkabhankoloos. big ol' tonhongerekoogers. what happens next?! transfer student shows up with even bigger bonkhonagahoogs. humongous hungolomghononoloughongous
disclaimer: i did not make this

some serious honkers. a real set of badonkers. packin some dobonhonkeros. massive doboonkabhankoloos. big ol' tonhongerekoogers. by u/yanzin_fan_of_altair February 11, 2020

Lethal serious 

If something is so lethal or so serious the one word just doesnt cut it. It's like when you take 40 chats and are off your face and your on some buzz.

These chats are lethal serious

Lethal serious by I amlethalilovechats August 10, 2019

serious business 

An expression said, often in a sarcastic, humorous way. Can be used in just about any context to describe something in a nonsensical way. internets

The internet is serious business.

serious business by Kyle2252 September 1, 2008