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.
An attractive and flirtatious underage girl that is deceptive with her age.
"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."