a straight male who bluntly translates another straight male's behavior for his straight female friend or friends.
Girl: "He said he wants to watch a movie and cuddle..."
Manslator: "Nah... he just wants to fuck you. But this way, he won't have to spend any money on taking you out."
Think along the lines of Justin Long's character in He's Just Not That Into You... but before he was into Gigi.