Why are you only asking guys to help you? Seems you're narrowing the field a bit, but what ever.
Here's an example of a dialect right here, *grin*
In my area "guys" is an informal form of the second-person plural. People in other regions might say "you guys," "y'all," or just "you." It is no more gender exclusive than "vosotros" would be in Spanish (although, admittedly, "vosotras" is gender exclusive).
I am from the States. When I visited Australia, I understood about 95% of what was being said ... until I meet people from the rural areas and then I needed a translator even though they were speaking English! The dialect and the accent was incredibly difficult for me.