The definition of a guy with an abnormal large forehead. Not because he is smart but for protection against the pouring rain. People often use a Jakob as an umbrella and can be refered to as a gutter
"Oh no! it started raining again..."
"Quickly grab Jakob he can cover us from the rain with his massive forehead"
"Quickly grab Jakob he can cover us from the rain with his massive forehead"
by Mastermind69 April 25, 2020