To become so desperate and outrageously bad about something, that your action has caused you personally to "jump the shark," making you a shark. Also, to cop out.
"Mike is hanging with his girl again tonight instead of going out with us."
"Ya man, he's totally sharked it."
"Hey guys, I think I'm going to stay in tonight and watch my crash DVD instead of party with you guys."
"SHAAARRRKKKKKK!"
This is a move when you have a woman on her hands and knees, doggie style. You put your hands together and make your way across the room, while humming the theme from Jaws. Then you cram all 8 fingers into her sloppy cunt.
"I was at this party on Sunday and everything was going good with this girl until my friend tipped me off that she was a shark! I almost got myself into some big trouble."