From the original German.
1)A simpleton, someone with limited mental faculties.
2) colloquial - a fancy person, possibly a pederast. Enjoys taking on the qualities and mannerisms of the opposite sex. Buggerer of young men.
Did you see the movie Silence of the Lambs at the German theatre last night?
Yes the subtitles called Buffalo Bill a drewgfroerer when he was dancing in woman's clothing and tucking his small penis behind his legs.