Here's a breakdown of what it might mean based on context:
* Informal command: It could be a shortened version of "Llégale" which means "Go get it/him/her" or "Get to it."
* Expression of excitement: It could be an expression of excitement like "Go for it!" or "Let's go!"
Without more context, it's impossible to say for sure what "llegale" means.
If you provide more information about the situation where you heard this word, I can give you a more accurate answer.