DuckCorp Dico

Found one definition

1.                 From English - German Ding/FreeDict dictionary ver. 1.9-fd1:
                   
   
   
                   
                     
   hard-on /hˈɑːd ˈɒn/
   Steife <masc>, Steifer, Ständer <masc>, Latte <fem> [slang]
            Note: erigierter Penis
         "early-morning hard-on"  - Morgenlatte
      Synonyms: stiffy, stiffie, boner, woody
    see: morning glory, piss-proud, morning wood