Real Dictionary

whip up
phrasal verb: If a force such as the wind whips up dust or water, it makes it rise up.
phrasal verb: If someone whips up an emotion, especially a dangerous one such as hatred, or if they whip people up into an emotional state, they deliberately cause and encourage people to feel that emotion.
phrasal verb: If you whip up something, especially a meal, you make it quickly.

whip up in American English
to plan or assemble quickly
to rouse; excite

whip up in British English
to excite; arouse