To be hot shit, alert and on top of everything. Only the finest can stay crispy while the masses lose it and turn soggy. You're the man! If you are crispy, then you have great swagger.

the whale tail is the shape formed when a g-string rides up high over a womans trousers

to be chill, cool, relaxed.

A joke within the Alexander Ludwig and/or the Hunger Games fandom. Alexander Ludwig frequently tells his fans to "Stay Crispy" via twitter, as he does with the term "Liv it up"