You may mean "rake." (See definition two at dictionary. com)This was definitely a term for a man who was, or was considered to be, a womanizer in Shakespeare's day. Mercutio may fall into this category, having quite a different attitude about love and women than does his friend Romeo. Mercutio does not believe in being tied down. Consider Act 1, Scene 4, lines 26-30. Mercutio tells Romeo: "If love be rough with you, be rough with love; / Prick love for pricking and beat love down. Give me a case to put my visage in: A visor is a visor."
Line should be easily understood: have a thick skin when it comes to love. Line 27 "prick love for pricking" is a sexual double entendre. Putting your "visage" (face) in a case ("a visor for a visor") alludes to the face being a mask, and puns on the masked costume balls that were popular in Shakespeare's time.