Term that defines a situation as concerning, important, or extensive. It is similar to the adjective "serious" but is most often used sarcastically, to imply stupidity or pointlessness.
Teacher: "Alright students, I hope you studied for this test!"
Student(to other students): "Yeah, I did some seeryous studying last night."
Teacher: "Okay kids, time to take a test!"
Student: "You're seeryous, aren't you?"
Teacher: "Well yes, I am."