Deep In The Money

A stock option is deeeeeeep in the money when the currrent trading price of the stock on which it is pegged is trading way above the strike place in a call option or way below in a put option.

Example: You bought a call option on KO with a strike of $30 when KO was at $25, having paid $3. Today, KO is $50, so the call option you bought is waaaaay deep in the money—$20 in this case, and you're $17 in profits. Nice trade.