One I learned a few decades ago has served me very well:

RADAFRADAFORDASEEDASAW!

Okay, it is a little difficult to sort in that form and so I'll break it down for you: Rada Frada Forda Seeda Saw! (All the a's are short, as in the word, hat.) This word is especially effective when used as something you mutter under your breath. It sounds every bit as emphatic as anything Popeye might have muttered - I think even better. Shouting it also delivers a certain amount of relief when used after smashing a finger - or such has been my experience.

The word has other uses as well. One of my favorites is to whisper it in someone's ear, but to do so with a degree of urgency in your voice. This works quite well in bars or other places where there is lots of loud stuff going on around you. The recipient of the whisper will try desperately to figure out the message which you are happy to repeat as many times as needed with the same degree of urgency.