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1)To be in a lot of trouble with some bad or shady people ( mostly those affiliated with orginized crime - money launders - anyone in the mafia )

2) Can be used as an excuse not to go somewhere or participate in a certain activity. When this excuse is used , people tend to stop asking questions about why you cannot do something. As they know how much danger you could be in .
1)After Tony barrowed 20 grand from the mafia (to pay for his grandmothers hip replacement ) and failed to pay it back within the set time period , he was officially in deep with some sharks

2) Since Alex did not want to go to homecoming with Sean, she told him

" I'm in deep with some sharks and I can't make it tonight, I'll explain later, tell my mother I love her."
by Charbie126 October 20, 2013
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