When your riding on a motorcycle blasting heavy metal and fuckin a chick spider style then hit a railroad track and slip out then back in to your chicks ass while never spilling your beer.
That dude's crazy..
I heard he landed a Dirty Jäger on his chick last night going over the tracks after the party.
Defined as the act of riding a motorcycle while having sex and after hitting a bump or railroad track the man slips out and re-enters into the woman's anus.
Did you see the look on her face after we crossed the tracks? That bump must have done her a dirty jäger