Extremely extreme, and/or viciously intense.
NOTE: “Whippin’” is technically an informal pronunciation of the word “whipping”, but no
way would anyone
ever say whipping when they meant whippin’. That'd just
sound silly. Plus, the word whippin’ is only used when one is excited as all heck, and in that state it's nigh impossible to say it with an ‘ing’ at the end.
“Whoa, you musta been so passed out. Cuz
dude, that last band was
like whippin’ loud!”
“That chick was
gnarly-fast. Did you see her calves? They were whippin’ huge!