The act of pouring a shot of Jägermeister over a girlsbreasts before placing your face inbetween said breasts, turning your head side-to-side and going "BRRRRRRRRRRRRRR".
Dude: I heard you did Jägerboats last night!?
Bro: Yeah, I poured my shot of Jäger on her tits and motorboated the shit outta her.
Jaegerboarding is when you sniff mustard off of a watermelon, take a hit from a joint, put mustard on a can of bud light and smash the can open on your head, drink the bud light, take a hit from a bong, smash the bong to pieces, drink half a glass off Jaegermeister, smash the earlier mentioned watermelon on your head, lie on the floor and pour the remaining Jaegermeister over your eyes and finally smash the bottle to the floor. Youth does this to assert dominance over their peers.
Yo, Wilhelm, did you see that weird kid Jaegerboarding himself? I definitelyrespect his actions and am thinking of doing the exact same thing!