Top Definition
A verb -

To seriousize

Present tense:

I am seriousizing
You are seriousizing
He/She/It is seriousizing
We are seriousizing
You are seriousizing
They are seriousizing

Past Tense:

I serious'd
You serious'd
He/She/It serious'd
We serious'd
You serious'd
They serious'd

It is what you do when you need to look serious. You serious.
"Jim was laughing, but then he serious'd because his mum came in."

"Could you guys seriousize a bit?"

"Yo dawg, us street-ghettoistics be seriousizing!"

"To seriousize. Or not to seriousize. That is the question."
by Yonasu June 28, 2008
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