Definition
Used to indicate that a preceding event or statement by another is an unsurprising accompaniment of known facts and circumstances.
How People Actually Use It
What you tell someone when they have successfully completed a task. If you have a puzzle you are trying to put together, and you finally finish it, you may be told to figure it out.
"I had just solved the problem when Lil' Tone jumped in and said 'figure it out'!"
Source: Urban Dictionary