Yes! In Afrikaans we have a word "knuip"
I think I'm spelling it right. It means hold your bum in so that you don't shit yourself, and also a figurative meaning. So that's what I did that morning : Knuip until I could knuip no more.

Edit: it's knyp
(Fantasma:, Fri 18 Oct 2024, 18:51, archived)