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It's a general disclosure. Not everyone uses a stop loss, and not everyone manages risk. When you open a position on margin, by definition you are effectively being 'loaned' money, and if the market does move quickly, you can be in a position such that your total loss is greater than what you have put up for margin. In this case, you will need to deposit funds to cover the margin.
In practice, most brokers will never let this happen and you will be automatically liquidated. Note this is only an issue really if you are really close to your max margin. For example, a broker gives $50 MES daytrade margin. You have a $1000 account. You foolishly open 20 contracts, which is the max allowable ($1000 / $50 => 20 contracts). If the market moves 10 handles against you, you will have no money left (-10 handles * $5 / handle * 20 contracts => -$1000) and will be auto-liquidated. In practice, they will liquidate you before this, as they require a minimum buffer, probably around $500.
slippage is definitely something to keep in mind especially when trading thinly traded contracts. Trading mini crude oil during an EIA number can cause a big loss... or big profit.
Besides slippage adding to your stop loss, a stop loss may or may not stop your loss at where you wanted it. How is your stop loss order triggered, by a bar finishing on your chart, crossing over something? What if there is a data burst, or a data delay? And where is the stop loss order residing? On your computer, at the broker's server or exchange ? If you read the disclaimer you signed when opening the account with your broker, it says you are responsible for any problem due to computer, power outage, internet .. etc. So your stop loss order may not function as planned when something happens. These don't happen often, but can ...
Just keep in mind leverage works both ways, to the upside and to the downside so you want to not over do it on the lot size especially in illiquid contracts.