A slang term used to describe a significant amount of money. The amount implied typically depends on the person, company or situation.
We may all have a different idea of what constitutes a "ton of money", but according to the Bureau of Engraving and Printing, a ton of $1 bills amounts to $908,000 - nearly $1 million!

If you're talking about a ton of coins, then it's a different story - a ton of quarters is worth $40,000, and one ton of pennies (363,000 pennies to be exact) is worth $3,630.