Usually when intoxicated, but not limited to, the act of Jaegering is to randomly lay down on the floor.
This can either be face down or flat on your back with limbs generally extended outwards.
It is not known why a person choose to Jaegar; most likely for a bit of cheeky relaxation during an alcohol fuelled evening.
Jaegaring can often result in being escorted from the establishment of the floor you've chosen to lay upon.
Girl: Hey, have you seen that girl on the dance floor?
Guy: Yeah, she's doing a spot of Jaegering.
Girl: I know, I see her here a lot. She loves to Jaeger!
Guy: Uh oh, the bouncer's are throwing her out.