Why wait until after the fact, when you can help prevent it from the start?
someone that has no perseverance, no patience to concentrate
אחד שאין לו סבלנות לשבת ללמוד או להתרכז
נישט האָבּן קײַן זיצפלייש
nit hobn kayn zitsfleysh
not to have the posterior to sit on
אין לו בשר לשבת (ישבן)י
Yiddish is rich with expressions. In fact, sometimes the same phrase can be said in a number of different ways. I try to bring the unique ones, where it is is not obvious from the literal translation what the expression means.