It's a phrase that's often used to describe someone who has taken their enthusiasm for something to the extreme. It's a phrase that can be used to describe a person who spends too much money on something, or a person who has overextended themselves in some way. It can also be used to describe someone who has put too much effort into something, or someone who has gone above and beyond what is necessary. Blow your load is a phrase that can be used to describe someone who has put too much energy into a task, and is now exhausted from the effort.