Sharkin (verb) - to knowingly [flirt] with a person who has a [significant other] while the significant other is not present, in an attempt to have [sexual relations] or get the couple to break up.\n> Person 1: Bro, you need to keep an eye on Jenny.\n> Person 2: Why?\n> Person 1: She was at that party with Tom and he was totally sharkin on her.\n> Billy: hey man are we heading to that girls house?\n> Chad: Yea but they both have boyfriends.\n> Billy: are their boyfriends going to be there?\n> Chad: nope...Fuck it...looks like we're sharkin tonight.\n