How would you transcribe this sound?

Here's some advice from the Los Angeles Times:

I checked with the Associated Press, and here's what Michael Giarrusso, AP's global sports editor, recommended:

"When Latin American announcers yell and stretch out the word goal, our recommendation is to add extra Os and exclamation points based on the duration and the volume of the scream. 'Gooooal!' would be a rather subtle yell. But, if Mexico were to score late in an important game, I could imagine a 'Gooooooooooal!!!'”