to pull a Iva Zanicchi

to shit in a public context.

Based on Iva Zanicchi who in 2000 in a well-known Italian program, while in live, took a shit behind a sofa

"I was at my friend's house playing Bang! but i had stomachache and the bathroom was occupied, so i pulled a Iva Zanicchi"

"Oh this pub has no bathroom.. i might have to pull a Iva Zanicchi"