Lollll definition of theory in sciene is fairly different my man.
Theory in the scientific sense means a set of testable, predictive structures and ideas that explain the observed facts.
To be considered a theory, an original hypothesis is presented with the above, its peered reviewed and re-tested constantly. The peer reviews are even reviewed.
Scientific theories are testable. New evidence should be compatible with a theory. If it isn't, the theory is refined or rejected.
Example.
I am sitting on the shitter. I hear my front door open, hear what sounds like foot steps walk up my stairs and my bedroom door close. After i wipe my bum, i look outside and see my wife's car. At the front door i see her handbag, a routine which happens frequently . I can reasonably theorise from the observable evidence that my wife is home. It could be a number of other scebarios, but based on the observable evidence, the probability is it is her, and until other evidence is presented, i believe that theory over others.