Fly/blow the coop American informal
This expression is an allusion to a chicken escaping from its coop (a cage).
If a person "flies/blows the coop", he/she leaves/gets away from a place hastily and without an announcement because the situation limits his/her freedom.
Such is a boring lesson that I have to fly the coop and go for a drink somewhere
Most teenagers look forward to blowing the coop when they turn 18 or 20. Because at these ages they are so excited about being independent.
The verb “fly" or "blow" should be conjugated according to its tense.
This term originally meant "escape from jail," known as the coop in underworld slang since the late 1700s. [the Late 1800s]