Top Definition
stands for BACK TO SCHOOL jetlag

occurs when middle school to college students return to school from any holiday breack.

Side effects incude: enerydrink drinking ; caffine overdoseing ; back of the room naps ; teacher ignoreing;back of the room texting ; class skiping; that "just, fuck it" feeling about everything; ect.
Teacher 1: "My students are paying less attintion to my lectures than they did in the begining of the year! What has happened?"

Teacher 2: "O yeah, they all just came from 2 weeks of sleep, must be BTS jetlag."
by Lax2hard Mistress December 31, 2012
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