What is probly?

As an AI language model, I cannot give information about "probly" because it does not exist as a word in the English language. However, I can provide information about "probably," which means "with a high degree of likelihood" or "most likely." It is an adverb commonly used in everyday language to express an assumption or hypothesis based on evidence or reasoning. For example, "It will probably rain today" suggests that it is likely to rain based on the current weather conditions or forecast.