Is this sentence correct?

[JustAlilBit]

While I was watching this video I pooped to my trunks

[emsr2d2]

While I was watching this video I pooped to my trunks

Firstly, a better (although rather unpleasant) title for your thread would have been "pooped to my trunks". I'm not sure how many people would have opened your post though!

Anyway, on to your question. The phrase in BrE, would be "I pooed my pants" (note that "to" is not required). There are a few variations on the phrase but I'd rather not go into them.

I would like to note that this is not a nice phrase and I would avoid using it, if I were you.

[riquecohen]

In AmE it would be "...in my trunks."

[Raymott]

In AusE, it might be "I shat myself", but a polite expression would be "I pooed my pants".
Note that it's only polite if you really need to say it. For most people, it would be "too much information."

[JustAlilBit]

I prefer American and Canadian English...
Americans & Candians doesn't use correct language, british does. That's why I prefer American and Canadian english. Besides, to understand is better Americans and Candians. I know not one people who still trying to understand British accent, but my friends can't cause it's too hard :)

[5jj]

Americans & Candians doesn't use correct language, b British people does.

That is simply not true. North Americans use different varieties of English from British English, but all the varieties are completely acceptable. Some British people use very informal language and/or slang, especially in speech, just as some North Americans do.

The standard British accent is no easier, or harder, to understand than standard North American accents. Of couse, if you have learnt one, the other(s) may take some getting used to.

[JustAlilBit]

That is simply not true. North Americans use different varieties of English from British English, but all the varieties are completely acceptable. Some British people use very informal language and/or slang, especially in speech, just as some North Americans do.

The standard British accent is no easier, or harder, to understand than standard North American accents. Of couse, if you have learnt one, the other(s) may take some getting used to.

Me is american english is easier.

[5jj]

Me is american english is easier.

JustAlilBit, we know you can write better English than that, and you know that the the words I have underlined need to begin with capital letters.

For others reading this thread, I think the message is meant to be, "In my opinion, American English is easier".

[Raymott]

I prefer American and Canadian English...
Americans & Candians doesn't use correct language, british does. That's why I prefer American and Canadian english.

This is nonsense, as a generalisation. But let's pretend there's some truth in it - Americans have a lower standard of language, and don't speak it correctly.
The inference (and the big mistake) you seem to be making is that if Americans don't speak English well, and if you don't speak English well, you should be able to communicate fluently with each other.
I can only wish you good luck - you're going to need it.

[emsr2d2]

I prefer American and Canadian English...
Americans & Candians doesn't use correct language, british does. That's why I prefer American and Canadian english.

This is the part that confused me. You are a student of English, yet you prefer to learn the English which you say is spoken incorrectly (American and Canadian versions of English).

That makes no sense at all. Even if it were true (which it isn't), no self-respecting language student would specifically wish to study incorrect forms of a language.

I would like to think we're having our legs pulled but I fear we're not.