When someone is very sexual but rough.
"He was very frisky last night."
When you are too exited, hyped,agitated about something stupid or useless.
She was frisky, because someones idea was better.
A guy who flirts to much on a first date or shortly after meeting a female. Typically with blatant sexual innuendo in attempt to entice a women into casual sex.
Oh wow, look at this frisky chicken trying to hit up Kelly.