Beast(ly) - adj. The characteristic of being good at something, or doing something incredible. (As a beast)
Dude: Way to be beastly by going up those stairs with your broken leg!
Dude: Yeah, it was beast when you got up there and sang in front of the school.
Being good at a certain things
K1: Did you see how she hit that ball?
K2: Yes, it was very beastly.
When a person or something are particularly skilled in some certain aspect.
Woah Ben is beastly at dancing the tango!
anything that is wildly and extremely (insert any adjective here)!
Person #1 - oh man! that AP US history summmer assignment is BEASTLY.
Person #2 - hell. yes.
Just IMMENSELY buff/fit/athletic
or just all around awesome
(Blank) "Dude did you see Ryan tackle that guy at the game "
(Friend) "Yeah dude hes beastly!"
beastly means to be so good at sumthing that you are almost like a beast
Rodney is a beastly soccer player
something or someone that can be described as really cool, awesome, fantastic, admirable, kickass, etc.
yeah dude obama's hella beastly for sure