whip up or whip out
"produce in a hurry"
https://www.merriam-webster.com/dictionary/whip"write something hurriedly" https://en.oxforddictionaries.com/definition/us/whip_something_out_(or_off)
However, "whip" occurs in several idioms and might confuse readers. "Whip out" can mean take out quickly. "Whip up" can mean excite.