How many wine coolers do you have to drink to get drunk?

That would depend on the amount of alcohol in the coolers, and whether or not you have yet developed a tolerance for alcohol (one of the first signs of a developing addiction). Other factors would be body size, gender, and liver condition.

There is also the issue of what you consider "drunk." Most people are well along the way to losing their ability to make good decisions and control emotions before they notice the physical deterioration that most people associate with drunkenness. That is why a 0.08 blood alcohol level is considered intoxicated in the US, whether you think you're drunk or not.