Word originating from the German modern day philosopher J.J.Brookman. Referring to a state of non-plus-ultra. The ultimate best thing that could happen to you. The top of all your dreams.
A dude having tickets for a game of the champions league is cool, a dude having tickets for the End Game of the world cup is fleech.
Dave: Hey J.J. ! I slept with TWO chicks yesterday in my flat!
J.J.: Jo Dave, that's pretty nice.
Dave: Huh ? Why ... ain't that fleech ? What is fleech ?
J.J.: Nope. Fleech is what I did yesterday; I slept with 12 chicks in the playboy house in Berlin.
Dave: Duuude, that IS fleech !