Cincinnati blowfish occurs when a woman gives a man a rim job, vice versa, and he/she farts in the mouth thus puffing up the cheeks.
Nick was giving a rim job to Veronica Vaughn and she farted in his mouth. He yelled "you just gave me the dirtiest cincinnati blowfish i have ever had". (He tasted shit for a week).
by The boyz at STEIN. April 4, 2010